chore: Update discovery artifacts (#1430)

## Deleted keys were detected in the following pre-stable discovery artifacts:
run v1alpha1 https://github.com/googleapis/google-api-python-client/commit/db18e29c7f616f212121960fe8efd6fb7cdf9b22

## Discovery Artifact Change Summary:
feat(artifactregistry): update the api https://github.com/googleapis/google-api-python-client/commit/bc9a38bf901a63525fb4c7b1e94fd4ce5fb441c3
feat(chat): update the api https://github.com/googleapis/google-api-python-client/commit/eea3c5c177aaded427fd3b5bab80812bf748ef79
feat(cloudasset): update the api https://github.com/googleapis/google-api-python-client/commit/2e31dd0b58d3c656df5aaa042994c637d0100f97
feat(cloudbuild): update the api https://github.com/googleapis/google-api-python-client/commit/3a3b420d53aabe1fdf6ddca483a3d164f72d6268
feat(composer): update the api https://github.com/googleapis/google-api-python-client/commit/78c0d8decbe640c522c45850c97002e7da12f4e0
feat(container): update the api https://github.com/googleapis/google-api-python-client/commit/a54737fe763fd288e54505faace58040cbf8920b
feat(datafusion): update the api https://github.com/googleapis/google-api-python-client/commit/f6bf3c6b92fbf7072798b987998bf55ee9276389
feat(dataproc): update the api https://github.com/googleapis/google-api-python-client/commit/3fde9a3604e4811ce02f1062dcee9cef35b1ad51
feat(documentai): update the api https://github.com/googleapis/google-api-python-client/commit/79c556d389889fb0f48c8cc5ad5ab4a2caaab603
feat(groupssettings): update the api https://github.com/googleapis/google-api-python-client/commit/d537f96a20a699629fa85fbdeadb74ead3b32699
feat(logging): update the api https://github.com/googleapis/google-api-python-client/commit/d3548c505e4b1065365584493d15f21a19639626
feat(monitoring): update the api https://github.com/googleapis/google-api-python-client/commit/d24af68a9621fda9d7a576d3615178604a1482d2
feat(paymentsresellersubscription): update the api https://github.com/googleapis/google-api-python-client/commit/cff9039529278d95cee936826b5406867c638430
feat(redis): update the api https://github.com/googleapis/google-api-python-client/commit/46102d1726393f872420820e6200bb83cefd74b6
feat(run): update the api https://github.com/googleapis/google-api-python-client/commit/db18e29c7f616f212121960fe8efd6fb7cdf9b22
feat(slides): update the api https://github.com/googleapis/google-api-python-client/commit/68634cd565914e6003c851ec5f43fa2ff290afca
feat(spanner): update the api https://github.com/googleapis/google-api-python-client/commit/289512124fc77a69957b912f06e9c3d315aa0526
feat(storagetransfer): update the api https://github.com/googleapis/google-api-python-client/commit/24895f156f10c03f2da686be95d8c70ea34008a3
diff --git a/docs/dyn/spanner_v1.projects.instances.databases.html b/docs/dyn/spanner_v1.projects.instances.databases.html
index aa4b0dc..a3a1780 100644
--- a/docs/dyn/spanner_v1.projects.instances.databases.html
+++ b/docs/dyn/spanner_v1.projects.instances.databases.html
@@ -455,6 +455,7 @@
                         "token": "A String", # The token identifying the message, e.g. 'METRIC_READ_CPU'. This should be unique within the service.
                       },
                       "startKeyIndex": 42, # The index of the start key in indexed_keys.
+                      "timeOffset": "A String", # The time offset. This is the time since the start of the time interval.
                       "unit": { # A message representing a user-facing string whose value may need to be translated before being displayed. # The unit of the metric. This is an unstructured field and will be mapped as is to the user.
                         "args": { # A map of arguments used when creating the localized message. Keys represent parameter names which may be used by the localized version when substituting dynamic values.
                           "a_key": "A String",