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+<h1><a href="tracing_v2.html">Google Tracing API</a> . <a href="tracing_v2.projects.html">projects</a> . <a href="tracing_v2.projects.traces.html">traces</a></h1>
+<h2>Instance Methods</h2>
+<p class="toc_element">
+  <code><a href="tracing_v2.projects.traces.spans.html">spans()</a></code>
+</p>
+<p class="firstline">Returns the spans Resource.</p>
+
+<p class="toc_element">
+  <code><a href="#batchWrite">batchWrite(name, body, x__xgafv=None)</a></code></p>
+<p class="firstline">Sends new spans to Stackdriver Trace or updates existing traces. If the</p>
+<p class="toc_element">
+  <code><a href="#list">list(parent, orderBy=None, startTime=None, pageSize=None, x__xgafv=None, pageToken=None, filter=None, endTime=None)</a></code></p>
+<p class="firstline">Returns of a list of traces that match the specified filter conditions.</p>
+<p class="toc_element">
+  <code><a href="#listSpans">listSpans(parent, pageToken=None, x__xgafv=None)</a></code></p>
+<p class="firstline">Returns a list of spans within a trace.</p>
+<p class="toc_element">
+  <code><a href="#listSpans_next">listSpans_next(previous_request, previous_response)</a></code></p>
+<p class="firstline">Retrieves the next page of results.</p>
+<p class="toc_element">
+  <code><a href="#list_next">list_next(previous_request, previous_response)</a></code></p>
+<p class="firstline">Retrieves the next page of results.</p>
+<h3>Method Details</h3>
+<div class="method">
+    <code class="details" id="batchWrite">batchWrite(name, body, x__xgafv=None)</code>
+  <pre>Sends new spans to Stackdriver Trace or updates existing traces. If the
+name of a trace that you send matches that of an existing trace, new spans
+are added to the existing trace. Attempt to update existing spans results
+undefined behavior. If the name does not match, a new trace is created
+with given set of spans.
+
+Args:
+  name: string, Name of the project where the spans belong to. Format is
+`projects/PROJECT_ID`. (required)
+  body: object, The request body. (required)
+    The object takes the form of:
+
+{ # The request message for the `BatchWriteSpans` method.
+    "spans": [ # A collection of spans.
+      { # A span represents a single operation within a trace. Spans can be nested
+          # to form a trace tree. Often, a trace contains a root span that
+          # describes the end-to-end latency and, optionally, one or more subspans for
+          # its sub-operations. (A trace could alternatively contain multiple root spans,
+          # or none at all.) Spans do not need to be contiguous. There may be gaps
+          # and/or overlaps between spans in a trace.
+        "status": { # The `Status` type defines a logical error model that is suitable for different # An optional final status for this span.
+            # programming environments, including REST APIs and RPC APIs. It is used by
+            # [gRPC](https://github.com/grpc). The error model is designed to be:
+            #
+            # - Simple to use and understand for most users
+            # - Flexible enough to meet unexpected needs
+            #
+            # # Overview
+            #
+            # The `Status` message contains three pieces of data: error code, error message,
+            # and error details. The error code should be an enum value of
+            # google.rpc.Code, but it may accept additional error codes if needed.  The
+            # error message should be a developer-facing English message that helps
+            # developers *understand* and *resolve* the error. If a localized user-facing
+            # error message is needed, put the localized message in the error details or
+            # localize it in the client. The optional error details may contain arbitrary
+            # information about the error. There is a predefined set of error detail types
+            # in the package `google.rpc` that can be used for common error conditions.
+            #
+            # # Language mapping
+            #
+            # The `Status` message is the logical representation of the error model, but it
+            # is not necessarily the actual wire format. When the `Status` message is
+            # exposed in different client libraries and different wire protocols, it can be
+            # mapped differently. For example, it will likely be mapped to some exceptions
+            # in Java, but more likely mapped to some error codes in C.
+            #
+            # # Other uses
+            #
+            # The error model and the `Status` message can be used in a variety of
+            # environments, either with or without APIs, to provide a
+            # consistent developer experience across different environments.
+            #
+            # Example uses of this error model include:
+            #
+            # - Partial errors. If a service needs to return partial errors to the client,
+            #     it may embed the `Status` in the normal response to indicate the partial
+            #     errors.
+            #
+            # - Workflow errors. A typical workflow has multiple steps. Each step may
+            #     have a `Status` message for error reporting.
+            #
+            # - Batch operations. If a client uses batch request and batch response, the
+            #     `Status` message should be used directly inside batch response, one for
+            #     each error sub-response.
+            #
+            # - Asynchronous operations. If an API call embeds asynchronous operation
+            #     results in its response, the status of those operations should be
+            #     represented directly using the `Status` message.
+            #
+            # - Logging. If some API errors are stored in logs, the message `Status` could
+            #     be used directly after any stripping needed for security/privacy reasons.
+          "message": "A String", # A developer-facing error message, which should be in English. Any
+              # user-facing error message should be localized and sent in the
+              # google.rpc.Status.details field, or localized by the client.
+          "code": 42, # The status code, which should be an enum value of google.rpc.Code.
+          "details": [ # A list of messages that carry the error details.  There will be a
+              # common set of message types for APIs to use.
+            {
+              "a_key": "", # Properties of the object. Contains field @type with type URL.
+            },
+          ],
+        },
+        "stackTrace": { # StackTrace collected in a trace. # Stack trace captured at the start of the span.
+          "stackTraceHashId": "A String", # The hash ID is used to conserve network bandwidth for duplicate
+              # stack traces within a single trace.
+              #
+              # Often multiple spans will have identical stack traces.
+              # The first occurrence of a stack trace should contain both the
+              # `stackFrame` content and a value in `stackTraceHashId`.
+              #
+              # Subsequent spans within the same request can refer
+              # to that stack trace by only setting `stackTraceHashId`.
+          "stackFrames": { # Represents collection of StackFrames that can be truncated. # Stack frames in this stack trace. A maximum of 128 frames are allowed.
+            "frame": [ # Stack frames in this stack trace.
+              { # Represents a single stack frame in a stack trace.
+                "columnNumber": "A String", # Column number is important in JavaScript (anonymous functions).
+                    # May not be available in some languages.
+                "functionName": { # Represents a string value that might be truncated. # The fully-qualified name that uniquely identifies this function or
+                    # method (up to 1024 characters).
+                  "truncatedCharacterCount": 42, # The number of characters truncated from the original string value. If 0 it
+                      # means that the string value was not truncated.
+                  "value": "A String", # The truncated string value. E.g. for a string attribute this may have up to
+                      # 256 bytes.
+                },
+                "fileName": { # Represents a string value that might be truncated. # The filename of the file containing this frame (up to 256 characters).
+                  "truncatedCharacterCount": 42, # The number of characters truncated from the original string value. If 0 it
+                      # means that the string value was not truncated.
+                  "value": "A String", # The truncated string value. E.g. for a string attribute this may have up to
+                      # 256 bytes.
+                },
+                "originalFunctionName": { # Represents a string value that might be truncated. # Used when the function name is
+                    # [mangled](http://www.avabodh.com/cxxin/namemangling.html). May be
+                    # fully-qualified (up to 1024 characters).
+                  "truncatedCharacterCount": 42, # The number of characters truncated from the original string value. If 0 it
+                      # means that the string value was not truncated.
+                  "value": "A String", # The truncated string value. E.g. for a string attribute this may have up to
+                      # 256 bytes.
+                },
+                "loadModule": { # Binary module. # Binary module the code is loaded from.
+                  "buildId": { # Represents a string value that might be truncated. # Build_id is a unique identifier for the module, usually a hash of its
+                      # contents (up to 128 characters).
+                    "truncatedCharacterCount": 42, # The number of characters truncated from the original string value. If 0 it
+                        # means that the string value was not truncated.
+                    "value": "A String", # The truncated string value. E.g. for a string attribute this may have up to
+                        # 256 bytes.
+                  },
+                  "module": { # Represents a string value that might be truncated. # E.g. main binary, kernel modules, and dynamic libraries
+                      # such as libc.so, sharedlib.so (up to 256 characters).
+                    "truncatedCharacterCount": 42, # The number of characters truncated from the original string value. If 0 it
+                        # means that the string value was not truncated.
+                    "value": "A String", # The truncated string value. E.g. for a string attribute this may have up to
+                        # 256 bytes.
+                  },
+                },
+                "lineNumber": "A String", # Line number of the frame.
+                "sourceVersion": { # Represents a string value that might be truncated. # The version of the deployed source code (up to 128 characters).
+                  "truncatedCharacterCount": 42, # The number of characters truncated from the original string value. If 0 it
+                      # means that the string value was not truncated.
+                  "value": "A String", # The truncated string value. E.g. for a string attribute this may have up to
+                      # 256 bytes.
+                },
+              },
+            ],
+            "droppedFramesCount": 42, # The number of dropped stack frames after the maximum size was enforced.
+                # If 0 then no frames were dropped.
+          },
+        },
+        "displayName": { # Represents a string value that might be truncated. # Description of the operation in the span. It is sanitized and displayed in
+            # the Stackdriver Trace tool in the
+            # {% dynamic print site_values.console_name %}.
+            # The display_name may be a method name or some other per-call site
+            # name. For the same executable and the same call point, a best practice is
+            # to use a consistent operation name, which makes it easier to correlate
+            # cross-trace spans.
+            # The maximum length for the display_name is 128 bytes.
+          "truncatedCharacterCount": 42, # The number of characters truncated from the original string value. If 0 it
+              # means that the string value was not truncated.
+          "value": "A String", # The truncated string value. E.g. for a string attribute this may have up to
+              # 256 bytes.
+        },
+        "name": "A String", # The resource name of Span in the format
+            # `projects/PROJECT_ID/traces/TRACE_ID/spans/SPAN_ID`.
+            # `TRACE_ID` is a unique identifier for a trace within a project and is a
+            # base16-encoded, case-insensitive string and is required to be 32 char long.
+            # `SPAN_ID` is a unique identifier for a span within a trace. It is a
+            # base 16-encoded, case-insensitive string of a 8-bytes array and is required
+            # to be 16 char long.
+        "links": { # A collection of links, which are references from this span to a span # A maximum of 128 links are allowed per Span.
+            # in the same or different trace.
+          "droppedLinksCount": 42, # The number of dropped links after the maximum size was enforced. If
+              # 0 then no links were dropped.
+          "link": [ # A collection of links.
+            { # A pointer from this span to another span in a different `Trace` within
+                # the same service project or within a different service project. Used
+                # (for example) in batching operations, where a single batch handler
+                # processes multiple requests from different traces or when receives a
+                # request from a different service project.
+              "spanId": "A String", # `SPAN_ID` is a unique identifier for a span within a trace. It is a
+                  # base16-encoded, case-insensitive string of a 8-bytes array and is
+                  # required to be 16 char long.
+              "traceId": "A String", # `TRACE_ID` is a unique identifier for a trace within a project. It is
+                  # a base16-encoded, case-insensitive string of a 16-bytes array and is
+                  # required to be 32 char long.
+              "type": "A String", # The relationship of the current span relative to the linked span.
+            },
+          ],
+        },
+        "parentSpanId": "A String", # ID of parent span which is a base 16-encoded, case-insensitive string of
+            # a 8-bytes array and is required to be 16 char long. If this is a root span,
+            # the value must be empty.
+        "startTime": "A String", # Start time of the span.
+            # On the client side, this is the local machine clock time at which the span
+            # execution was started; on the server
+            # side, this is the time at which the server application handler started
+            # running.
+        "spanId": "A String", # Unique identifier for a span within a trace. It is a base 16-encoded,
+            # case-insensitive string of a 8-bytes array and is required.
+        "attributes": { # Attributes of a span with a key:value format. # A set of attributes on the span. A maximum of 32 attributes are allowed per
+            # Span.
+          "droppedAttributesCount": 42, # The number of dropped attributes after the maximum size was enforced. If
+              # 0 then no attributes were dropped.
+          "attributeMap": { # The maximum key length is 128 bytes (attributes are dropped if the
+              # key size is larger than the maximum allowed). The value can be a string
+              # (up to 256 bytes), integer, or boolean (true/false). Some common pair
+              # examples:
+              #
+              #     "/instance_id": "my-instance"
+              #     "/zone": "us-central1-a"
+              #     "/grpc/peer_address": "ip:port" (dns, etc.)
+              #     "/grpc/deadline": "Duration"
+              #     "/http/user_agent"
+              #     "/http/request_bytes": 300
+              #     "/http/response_bytes": 1200
+              #     "/http/url": google.com/apis
+              #     "abc.com/myattribute": true
+            "a_key": { # The allowed types for the value side of an attribute key:value pair.
+              "stringValue": { # Represents a string value that might be truncated. # A string value (up to 256 bytes).
+                "truncatedCharacterCount": 42, # The number of characters truncated from the original string value. If 0 it
+                    # means that the string value was not truncated.
+                "value": "A String", # The truncated string value. E.g. for a string attribute this may have up to
+                    # 256 bytes.
+              },
+              "intValue": "A String", # An integer value.
+              "boolValue": True or False, # A boolean value.
+            },
+          },
+        },
+        "timeEvents": { # A collection of `TimeEvent`s. A `TimeEvent` is a time-stamped annotation # A maximum of 32 annotations and 128 network events are allowed per Span.
+            # on the span, consisting of either user-supplied key:value pairs, or
+            # details of an RPC message sent/received on the network.
+          "timeEvent": [ # A collection of `TimeEvent`s.
+            { # A time-stamped annotation in the Span.
+              "networkEvent": { # An event describing an RPC message sent/received on the network. A # An event describing an RPC message sent/received on the network.
+                  # maximum of 128 network events are allowed per Span.
+                "messageSize": "A String", # The number of bytes sent or received.
+                "messageId": "A String", # An identifier for the message, which must be unique in this span.
+                "type": "A String", # Type of NetworkEvent. Indicates whether the RPC message was sent or
+                    # received.
+                "time": "A String", # If available, this is the kernel time:
+                    #
+                    # *  For sent messages, this is the time at which the first bit was sent.
+                    # *  For received messages, this is the time at which the last bit was
+                    #    received.
+              },
+              "annotation": { # Text annotation with a set of attributes. A maximum of 32 annotations are # One or more key:value pairs.
+                  # allowed per Span.
+                "attributes": { # Attributes of a span with a key:value format. # A set of attributes on the annotation. A maximum of 4 attributes are
+                    # allowed per Annotation.
+                  "droppedAttributesCount": 42, # The number of dropped attributes after the maximum size was enforced. If
+                      # 0 then no attributes were dropped.
+                  "attributeMap": { # The maximum key length is 128 bytes (attributes are dropped if the
+                      # key size is larger than the maximum allowed). The value can be a string
+                      # (up to 256 bytes), integer, or boolean (true/false). Some common pair
+                      # examples:
+                      #
+                      #     "/instance_id": "my-instance"
+                      #     "/zone": "us-central1-a"
+                      #     "/grpc/peer_address": "ip:port" (dns, etc.)
+                      #     "/grpc/deadline": "Duration"
+                      #     "/http/user_agent"
+                      #     "/http/request_bytes": 300
+                      #     "/http/response_bytes": 1200
+                      #     "/http/url": google.com/apis
+                      #     "abc.com/myattribute": true
+                    "a_key": { # The allowed types for the value side of an attribute key:value pair.
+                      "stringValue": { # Represents a string value that might be truncated. # A string value (up to 256 bytes).
+                        "truncatedCharacterCount": 42, # The number of characters truncated from the original string value. If 0 it
+                            # means that the string value was not truncated.
+                        "value": "A String", # The truncated string value. E.g. for a string attribute this may have up to
+                            # 256 bytes.
+                      },
+                      "intValue": "A String", # An integer value.
+                      "boolValue": True or False, # A boolean value.
+                    },
+                  },
+                },
+                "description": { # Represents a string value that might be truncated. # A user-supplied message describing the event. The maximum length for
+                    # the description is 256 bytes.
+                  "truncatedCharacterCount": 42, # The number of characters truncated from the original string value. If 0 it
+                      # means that the string value was not truncated.
+                  "value": "A String", # The truncated string value. E.g. for a string attribute this may have up to
+                      # 256 bytes.
+                },
+              },
+              "time": "A String", # The timestamp indicating the time the event occurred.
+            },
+          ],
+          "droppedNetworkEventsCount": 42, # The number of dropped network events after the maximum size was enforced.
+              # If 0 then no annotations were dropped.
+          "droppedAnnotationsCount": 42, # The number of dropped annotations after the maximum size was enforced. If
+              # 0 then no annotations were dropped.
+        },
+        "endTime": "A String", # End time of the span.
+            # On the client side, this is the local machine clock time at which the span
+            # execution was ended; on the server
+            # side, this is the time at which the server application handler stopped
+            # running.
+      },
+    ],
+  }
+
+  x__xgafv: string, V1 error format.
+    Allowed values
+      1 - v1 error format
+      2 - v2 error format
+
+Returns:
+  An object of the form:
+
+    { # A generic empty message that you can re-use to avoid defining duplicated
+      # empty messages in your APIs. A typical example is to use it as the request
+      # or the response type of an API method. For instance:
+      #
+      #     service Foo {
+      #       rpc Bar(google.protobuf.Empty) returns (google.protobuf.Empty);
+      #     }
+      #
+      # The JSON representation for `Empty` is empty JSON object `{}`.
+  }</pre>
+</div>
+
+<div class="method">
+    <code class="details" id="list">list(parent, orderBy=None, startTime=None, pageSize=None, x__xgafv=None, pageToken=None, filter=None, endTime=None)</code>
+  <pre>Returns of a list of traces that match the specified filter conditions.
+
+Args:
+  parent: string, ID of the Cloud project where the trace data is stored which is
+`projects/PROJECT_ID`. (required)
+  orderBy: string, Field used to sort the returned traces. Optional.
+Can be one of the following:
+
+*   `trace_id`
+*   `name` (`name` field of root span in the trace)
+*   `duration` (difference between `end_time` and `start_time` fields of
+     the root span)
+*   `start` (`start_time` field of the root span)
+
+Descending order can be specified by appending `desc` to the sort field
+(for example, `name desc`).
+
+Only one sort field is permitted.
+  startTime: string, Start of the time interval (inclusive) during which the trace data was
+collected from the application.
+  pageSize: integer, Maximum number of traces to return. If not specified or <= 0, the
+implementation selects a reasonable value. The implementation may
+return fewer traces than the requested page size. Optional.
+  x__xgafv: string, V1 error format.
+    Allowed values
+      1 - v1 error format
+      2 - v2 error format
+  pageToken: string, Token identifying the page of results to return. If provided, use the
+value of the `next_page_token` field from a previous request. Optional.
+  filter: string, An optional filter for the request.
+Example:
+`version_label_key:a some_label:some_label_key`
+returns traces from version `a` and has `some_label` with `some_label_key`.
+  endTime: string, End of the time interval (inclusive) during which the trace data was
+collected from the application.
+
+Returns:
+  An object of the form:
+
+    { # The response message for the `ListTraces` method.
+    "nextPageToken": "A String", # If defined, indicates that there are more traces that match the request
+        # and that this value should be passed to the next request to continue
+        # retrieving additional traces.
+    "traces": [ # List of trace records returned.
+      { # A trace describes how long it takes for an application to perform some
+          # operations. It consists of a set of spans, each representing
+          # an operation and including time information and operation details.
+        "name": "A String", # The resource name of Trace in the format
+            # `projects/PROJECT_ID/traces/TRACE_ID`. `TRACE_ID` is a unique identifier
+            # for a trace within a project and is a base16-encoded, case-insensitive
+            # string and is required to be 32 char long.
+      },
+    ],
+  }</pre>
+</div>
+
+<div class="method">
+    <code class="details" id="listSpans">listSpans(parent, pageToken=None, x__xgafv=None)</code>
+  <pre>Returns a list of spans within a trace.
+
+Args:
+  parent: string, ID of the trace for which to list child spans. Format is
+`projects/PROJECT_ID/traces/TRACE_ID`. (required)
+  pageToken: string, Token identifying the page of results to return. If provided, use the
+value of the `nextPageToken` field from a previous request. Optional.
+  x__xgafv: string, V1 error format.
+    Allowed values
+      1 - v1 error format
+      2 - v2 error format
+
+Returns:
+  An object of the form:
+
+    { # The response message for the `ListSpans` method.
+    "nextPageToken": "A String", # If defined, indicates that there are more spans that match the request.
+        # Pass this as the value of `pageToken` in a subsequent request to retrieve
+        # additional spans.
+    "spans": [ # The requested spans if there are any in the specified trace.
+      { # A span represents a single operation within a trace. Spans can be nested
+          # to form a trace tree. Often, a trace contains a root span that
+          # describes the end-to-end latency and, optionally, one or more subspans for
+          # its sub-operations. (A trace could alternatively contain multiple root spans,
+          # or none at all.) Spans do not need to be contiguous. There may be gaps
+          # and/or overlaps between spans in a trace.
+        "status": { # The `Status` type defines a logical error model that is suitable for different # An optional final status for this span.
+            # programming environments, including REST APIs and RPC APIs. It is used by
+            # [gRPC](https://github.com/grpc). The error model is designed to be:
+            #
+            # - Simple to use and understand for most users
+            # - Flexible enough to meet unexpected needs
+            #
+            # # Overview
+            #
+            # The `Status` message contains three pieces of data: error code, error message,
+            # and error details. The error code should be an enum value of
+            # google.rpc.Code, but it may accept additional error codes if needed.  The
+            # error message should be a developer-facing English message that helps
+            # developers *understand* and *resolve* the error. If a localized user-facing
+            # error message is needed, put the localized message in the error details or
+            # localize it in the client. The optional error details may contain arbitrary
+            # information about the error. There is a predefined set of error detail types
+            # in the package `google.rpc` that can be used for common error conditions.
+            #
+            # # Language mapping
+            #
+            # The `Status` message is the logical representation of the error model, but it
+            # is not necessarily the actual wire format. When the `Status` message is
+            # exposed in different client libraries and different wire protocols, it can be
+            # mapped differently. For example, it will likely be mapped to some exceptions
+            # in Java, but more likely mapped to some error codes in C.
+            #
+            # # Other uses
+            #
+            # The error model and the `Status` message can be used in a variety of
+            # environments, either with or without APIs, to provide a
+            # consistent developer experience across different environments.
+            #
+            # Example uses of this error model include:
+            #
+            # - Partial errors. If a service needs to return partial errors to the client,
+            #     it may embed the `Status` in the normal response to indicate the partial
+            #     errors.
+            #
+            # - Workflow errors. A typical workflow has multiple steps. Each step may
+            #     have a `Status` message for error reporting.
+            #
+            # - Batch operations. If a client uses batch request and batch response, the
+            #     `Status` message should be used directly inside batch response, one for
+            #     each error sub-response.
+            #
+            # - Asynchronous operations. If an API call embeds asynchronous operation
+            #     results in its response, the status of those operations should be
+            #     represented directly using the `Status` message.
+            #
+            # - Logging. If some API errors are stored in logs, the message `Status` could
+            #     be used directly after any stripping needed for security/privacy reasons.
+          "message": "A String", # A developer-facing error message, which should be in English. Any
+              # user-facing error message should be localized and sent in the
+              # google.rpc.Status.details field, or localized by the client.
+          "code": 42, # The status code, which should be an enum value of google.rpc.Code.
+          "details": [ # A list of messages that carry the error details.  There will be a
+              # common set of message types for APIs to use.
+            {
+              "a_key": "", # Properties of the object. Contains field @type with type URL.
+            },
+          ],
+        },
+        "stackTrace": { # StackTrace collected in a trace. # Stack trace captured at the start of the span.
+          "stackTraceHashId": "A String", # The hash ID is used to conserve network bandwidth for duplicate
+              # stack traces within a single trace.
+              #
+              # Often multiple spans will have identical stack traces.
+              # The first occurrence of a stack trace should contain both the
+              # `stackFrame` content and a value in `stackTraceHashId`.
+              #
+              # Subsequent spans within the same request can refer
+              # to that stack trace by only setting `stackTraceHashId`.
+          "stackFrames": { # Represents collection of StackFrames that can be truncated. # Stack frames in this stack trace. A maximum of 128 frames are allowed.
+            "frame": [ # Stack frames in this stack trace.
+              { # Represents a single stack frame in a stack trace.
+                "columnNumber": "A String", # Column number is important in JavaScript (anonymous functions).
+                    # May not be available in some languages.
+                "functionName": { # Represents a string value that might be truncated. # The fully-qualified name that uniquely identifies this function or
+                    # method (up to 1024 characters).
+                  "truncatedCharacterCount": 42, # The number of characters truncated from the original string value. If 0 it
+                      # means that the string value was not truncated.
+                  "value": "A String", # The truncated string value. E.g. for a string attribute this may have up to
+                      # 256 bytes.
+                },
+                "fileName": { # Represents a string value that might be truncated. # The filename of the file containing this frame (up to 256 characters).
+                  "truncatedCharacterCount": 42, # The number of characters truncated from the original string value. If 0 it
+                      # means that the string value was not truncated.
+                  "value": "A String", # The truncated string value. E.g. for a string attribute this may have up to
+                      # 256 bytes.
+                },
+                "originalFunctionName": { # Represents a string value that might be truncated. # Used when the function name is
+                    # [mangled](http://www.avabodh.com/cxxin/namemangling.html). May be
+                    # fully-qualified (up to 1024 characters).
+                  "truncatedCharacterCount": 42, # The number of characters truncated from the original string value. If 0 it
+                      # means that the string value was not truncated.
+                  "value": "A String", # The truncated string value. E.g. for a string attribute this may have up to
+                      # 256 bytes.
+                },
+                "loadModule": { # Binary module. # Binary module the code is loaded from.
+                  "buildId": { # Represents a string value that might be truncated. # Build_id is a unique identifier for the module, usually a hash of its
+                      # contents (up to 128 characters).
+                    "truncatedCharacterCount": 42, # The number of characters truncated from the original string value. If 0 it
+                        # means that the string value was not truncated.
+                    "value": "A String", # The truncated string value. E.g. for a string attribute this may have up to
+                        # 256 bytes.
+                  },
+                  "module": { # Represents a string value that might be truncated. # E.g. main binary, kernel modules, and dynamic libraries
+                      # such as libc.so, sharedlib.so (up to 256 characters).
+                    "truncatedCharacterCount": 42, # The number of characters truncated from the original string value. If 0 it
+                        # means that the string value was not truncated.
+                    "value": "A String", # The truncated string value. E.g. for a string attribute this may have up to
+                        # 256 bytes.
+                  },
+                },
+                "lineNumber": "A String", # Line number of the frame.
+                "sourceVersion": { # Represents a string value that might be truncated. # The version of the deployed source code (up to 128 characters).
+                  "truncatedCharacterCount": 42, # The number of characters truncated from the original string value. If 0 it
+                      # means that the string value was not truncated.
+                  "value": "A String", # The truncated string value. E.g. for a string attribute this may have up to
+                      # 256 bytes.
+                },
+              },
+            ],
+            "droppedFramesCount": 42, # The number of dropped stack frames after the maximum size was enforced.
+                # If 0 then no frames were dropped.
+          },
+        },
+        "displayName": { # Represents a string value that might be truncated. # Description of the operation in the span. It is sanitized and displayed in
+            # the Stackdriver Trace tool in the
+            # {% dynamic print site_values.console_name %}.
+            # The display_name may be a method name or some other per-call site
+            # name. For the same executable and the same call point, a best practice is
+            # to use a consistent operation name, which makes it easier to correlate
+            # cross-trace spans.
+            # The maximum length for the display_name is 128 bytes.
+          "truncatedCharacterCount": 42, # The number of characters truncated from the original string value. If 0 it
+              # means that the string value was not truncated.
+          "value": "A String", # The truncated string value. E.g. for a string attribute this may have up to
+              # 256 bytes.
+        },
+        "name": "A String", # The resource name of Span in the format
+            # `projects/PROJECT_ID/traces/TRACE_ID/spans/SPAN_ID`.
+            # `TRACE_ID` is a unique identifier for a trace within a project and is a
+            # base16-encoded, case-insensitive string and is required to be 32 char long.
+            # `SPAN_ID` is a unique identifier for a span within a trace. It is a
+            # base 16-encoded, case-insensitive string of a 8-bytes array and is required
+            # to be 16 char long.
+        "links": { # A collection of links, which are references from this span to a span # A maximum of 128 links are allowed per Span.
+            # in the same or different trace.
+          "droppedLinksCount": 42, # The number of dropped links after the maximum size was enforced. If
+              # 0 then no links were dropped.
+          "link": [ # A collection of links.
+            { # A pointer from this span to another span in a different `Trace` within
+                # the same service project or within a different service project. Used
+                # (for example) in batching operations, where a single batch handler
+                # processes multiple requests from different traces or when receives a
+                # request from a different service project.
+              "spanId": "A String", # `SPAN_ID` is a unique identifier for a span within a trace. It is a
+                  # base16-encoded, case-insensitive string of a 8-bytes array and is
+                  # required to be 16 char long.
+              "traceId": "A String", # `TRACE_ID` is a unique identifier for a trace within a project. It is
+                  # a base16-encoded, case-insensitive string of a 16-bytes array and is
+                  # required to be 32 char long.
+              "type": "A String", # The relationship of the current span relative to the linked span.
+            },
+          ],
+        },
+        "parentSpanId": "A String", # ID of parent span which is a base 16-encoded, case-insensitive string of
+            # a 8-bytes array and is required to be 16 char long. If this is a root span,
+            # the value must be empty.
+        "startTime": "A String", # Start time of the span.
+            # On the client side, this is the local machine clock time at which the span
+            # execution was started; on the server
+            # side, this is the time at which the server application handler started
+            # running.
+        "spanId": "A String", # Unique identifier for a span within a trace. It is a base 16-encoded,
+            # case-insensitive string of a 8-bytes array and is required.
+        "attributes": { # Attributes of a span with a key:value format. # A set of attributes on the span. A maximum of 32 attributes are allowed per
+            # Span.
+          "droppedAttributesCount": 42, # The number of dropped attributes after the maximum size was enforced. If
+              # 0 then no attributes were dropped.
+          "attributeMap": { # The maximum key length is 128 bytes (attributes are dropped if the
+              # key size is larger than the maximum allowed). The value can be a string
+              # (up to 256 bytes), integer, or boolean (true/false). Some common pair
+              # examples:
+              #
+              #     "/instance_id": "my-instance"
+              #     "/zone": "us-central1-a"
+              #     "/grpc/peer_address": "ip:port" (dns, etc.)
+              #     "/grpc/deadline": "Duration"
+              #     "/http/user_agent"
+              #     "/http/request_bytes": 300
+              #     "/http/response_bytes": 1200
+              #     "/http/url": google.com/apis
+              #     "abc.com/myattribute": true
+            "a_key": { # The allowed types for the value side of an attribute key:value pair.
+              "stringValue": { # Represents a string value that might be truncated. # A string value (up to 256 bytes).
+                "truncatedCharacterCount": 42, # The number of characters truncated from the original string value. If 0 it
+                    # means that the string value was not truncated.
+                "value": "A String", # The truncated string value. E.g. for a string attribute this may have up to
+                    # 256 bytes.
+              },
+              "intValue": "A String", # An integer value.
+              "boolValue": True or False, # A boolean value.
+            },
+          },
+        },
+        "timeEvents": { # A collection of `TimeEvent`s. A `TimeEvent` is a time-stamped annotation # A maximum of 32 annotations and 128 network events are allowed per Span.
+            # on the span, consisting of either user-supplied key:value pairs, or
+            # details of an RPC message sent/received on the network.
+          "timeEvent": [ # A collection of `TimeEvent`s.
+            { # A time-stamped annotation in the Span.
+              "networkEvent": { # An event describing an RPC message sent/received on the network. A # An event describing an RPC message sent/received on the network.
+                  # maximum of 128 network events are allowed per Span.
+                "messageSize": "A String", # The number of bytes sent or received.
+                "messageId": "A String", # An identifier for the message, which must be unique in this span.
+                "type": "A String", # Type of NetworkEvent. Indicates whether the RPC message was sent or
+                    # received.
+                "time": "A String", # If available, this is the kernel time:
+                    #
+                    # *  For sent messages, this is the time at which the first bit was sent.
+                    # *  For received messages, this is the time at which the last bit was
+                    #    received.
+              },
+              "annotation": { # Text annotation with a set of attributes. A maximum of 32 annotations are # One or more key:value pairs.
+                  # allowed per Span.
+                "attributes": { # Attributes of a span with a key:value format. # A set of attributes on the annotation. A maximum of 4 attributes are
+                    # allowed per Annotation.
+                  "droppedAttributesCount": 42, # The number of dropped attributes after the maximum size was enforced. If
+                      # 0 then no attributes were dropped.
+                  "attributeMap": { # The maximum key length is 128 bytes (attributes are dropped if the
+                      # key size is larger than the maximum allowed). The value can be a string
+                      # (up to 256 bytes), integer, or boolean (true/false). Some common pair
+                      # examples:
+                      #
+                      #     "/instance_id": "my-instance"
+                      #     "/zone": "us-central1-a"
+                      #     "/grpc/peer_address": "ip:port" (dns, etc.)
+                      #     "/grpc/deadline": "Duration"
+                      #     "/http/user_agent"
+                      #     "/http/request_bytes": 300
+                      #     "/http/response_bytes": 1200
+                      #     "/http/url": google.com/apis
+                      #     "abc.com/myattribute": true
+                    "a_key": { # The allowed types for the value side of an attribute key:value pair.
+                      "stringValue": { # Represents a string value that might be truncated. # A string value (up to 256 bytes).
+                        "truncatedCharacterCount": 42, # The number of characters truncated from the original string value. If 0 it
+                            # means that the string value was not truncated.
+                        "value": "A String", # The truncated string value. E.g. for a string attribute this may have up to
+                            # 256 bytes.
+                      },
+                      "intValue": "A String", # An integer value.
+                      "boolValue": True or False, # A boolean value.
+                    },
+                  },
+                },
+                "description": { # Represents a string value that might be truncated. # A user-supplied message describing the event. The maximum length for
+                    # the description is 256 bytes.
+                  "truncatedCharacterCount": 42, # The number of characters truncated from the original string value. If 0 it
+                      # means that the string value was not truncated.
+                  "value": "A String", # The truncated string value. E.g. for a string attribute this may have up to
+                      # 256 bytes.
+                },
+              },
+              "time": "A String", # The timestamp indicating the time the event occurred.
+            },
+          ],
+          "droppedNetworkEventsCount": 42, # The number of dropped network events after the maximum size was enforced.
+              # If 0 then no annotations were dropped.
+          "droppedAnnotationsCount": 42, # The number of dropped annotations after the maximum size was enforced. If
+              # 0 then no annotations were dropped.
+        },
+        "endTime": "A String", # End time of the span.
+            # On the client side, this is the local machine clock time at which the span
+            # execution was ended; on the server
+            # side, this is the time at which the server application handler stopped
+            # running.
+      },
+    ],
+  }</pre>
+</div>
+
+<div class="method">
+    <code class="details" id="listSpans_next">listSpans_next(previous_request, previous_response)</code>
+  <pre>Retrieves the next page of results.
+
+Args:
+  previous_request: The request for the previous page. (required)
+  previous_response: The response from the request for the previous page. (required)
+
+Returns:
+  A request object that you can call 'execute()' on to request the next
+  page. Returns None if there are no more items in the collection.
+    </pre>
+</div>
+
+<div class="method">
+    <code class="details" id="list_next">list_next(previous_request, previous_response)</code>
+  <pre>Retrieves the next page of results.
+
+Args:
+  previous_request: The request for the previous page. (required)
+  previous_response: The response from the request for the previous page. (required)
+
+Returns:
+  A request object that you can call 'execute()' on to request the next
+  page. Returns None if there are no more items in the collection.
+    </pre>
+</div>
+
+</body></html>
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