Clean and regen docs (#401)

diff --git a/docs/dyn/cloudtrace_v1.projects.traces.html b/docs/dyn/cloudtrace_v1.projects.traces.html
index db3d77a..4373981 100644
--- a/docs/dyn/cloudtrace_v1.projects.traces.html
+++ b/docs/dyn/cloudtrace_v1.projects.traces.html
@@ -122,7 +122,38 @@
             # to use a consistent name, which makes it easier to correlate
             # cross-trace spans.
         "labels": { # Collection of labels associated with the span. Label keys must be less than
-            # 128 bytes. Label values must be less than 16 kilobytes.
+            # 128 bytes. Label values must be less than 16 kilobytes (10MB for
+            # `/stacktrace` values).
+            #
+            # Some predefined label keys exist, or you may create your own. When creating
+            # your own, we recommend the following formats:
+            #
+            # * `/category/product/key` for agents of well-known products (e.g.
+            #   `/db/mongodb/read_size`).
+            # * `short_host/path/key` for domain-specific keys (e.g.
+            #   `foo.com/myproduct/bar`)
+            #
+            # Predefined labels include:
+            #
+            # *   `/agent`
+            # *   `/component`
+            # *   `/error/message`
+            # *   `/error/name`
+            # *   `/http/client_city`
+            # *   `/http/client_country`
+            # *   `/http/client_protocol`
+            # *   `/http/client_region`
+            # *   `/http/host`
+            # *   `/http/method`
+            # *   `/http/redirected_url`
+            # *   `/http/request/size`
+            # *   `/http/response/size`
+            # *   `/http/status_code`
+            # *   `/http/url`
+            # *   `/http/user_agent`
+            # *   `/pid`
+            # *   `/stacktrace`
+            # *   `/tid`
           "a_key": "A String",
         },
         "parentSpanId": "A String", # ID of the parent span, if any. Optional.
@@ -154,7 +185,7 @@
 (for example, `name desc`).
 
 Only one sort field is permitted.
-  startTime: string, End of the time interval (inclusive) during which the trace data was
+  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
@@ -165,8 +196,37 @@
       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.
-  endTime: string, Start of the time interval (inclusive) during which the trace data was
+  filter: string, An optional filter against labels for the request.
+
+By default, searches use prefix matching. To specify exact match, prepend
+a plus symbol (`+`) to the search term.
+Multiple terms are ANDed. Syntax:
+
+*   `root:NAME_PREFIX` or `NAME_PREFIX`: Return traces where any root
+    span starts with `NAME_PREFIX`.
+*   `+root:NAME` or `+NAME`: Return traces where any root span's name is
+    exactly `NAME`.
+*   `span:NAME_PREFIX`: Return traces where any span starts with
+    `NAME_PREFIX`.
+*   `+span:NAME`: Return traces where any span's name is exactly
+    `NAME`.
+*   `latency:DURATION`: Return traces whose overall latency is
+    greater or equal to than `DURATION`. Accepted units are nanoseconds
+    (`ns`), milliseconds (`ms`), and seconds (`s`). Default is `ms`. For
+    example, `latency:24ms` returns traces whose overall latency
+    is greater than or equal to 24 milliseconds.
+*   `label:LABEL_KEY`: Return all traces containing the specified
+    label key (exact match, case-sensitive) regardless of the key:value
+    pair's value (including empty values).
+*   `LABEL_KEY:VALUE_PREFIX`: Return all traces containing the specified
+    label key (exact match, case-sensitive) whose value starts with
+    `VALUE_PREFIX`. Both a key and a value must be specified.
+*   `+LABEL_KEY:VALUE`: Return all traces containing a key:value pair
+    exactly matching the specified text. Both a key and a value must be
+    specified.
+*   `method:VALUE`: Equivalent to `/http/method:VALUE`.
+*   `url:VALUE`: Equivalent to `/http/url:VALUE`.
+  endTime: string, End of the time interval (inclusive) during which the trace data was
 collected from the application.
   view: string, Type of data returned for traces in the list. Optional. Default is
 `MINIMAL`.
@@ -202,7 +262,38 @@
                 # to use a consistent name, which makes it easier to correlate
                 # cross-trace spans.
             "labels": { # Collection of labels associated with the span. Label keys must be less than
-                # 128 bytes. Label values must be less than 16 kilobytes.
+                # 128 bytes. Label values must be less than 16 kilobytes (10MB for
+                # `/stacktrace` values).
+                #
+                # Some predefined label keys exist, or you may create your own. When creating
+                # your own, we recommend the following formats:
+                #
+                # * `/category/product/key` for agents of well-known products (e.g.
+                #   `/db/mongodb/read_size`).
+                # * `short_host/path/key` for domain-specific keys (e.g.
+                #   `foo.com/myproduct/bar`)
+                #
+                # Predefined labels include:
+                #
+                # *   `/agent`
+                # *   `/component`
+                # *   `/error/message`
+                # *   `/error/name`
+                # *   `/http/client_city`
+                # *   `/http/client_country`
+                # *   `/http/client_protocol`
+                # *   `/http/client_region`
+                # *   `/http/host`
+                # *   `/http/method`
+                # *   `/http/redirected_url`
+                # *   `/http/request/size`
+                # *   `/http/response/size`
+                # *   `/http/status_code`
+                # *   `/http/url`
+                # *   `/http/user_agent`
+                # *   `/pid`
+                # *   `/stacktrace`
+                # *   `/tid`
               "a_key": "A String",
             },
             "parentSpanId": "A String", # ID of the parent span, if any. Optional.