[QUESTION] What values should we use for our user agent?

[dhermes]

This came up in #2367. In node, they use gcloud-node-{SERVICE}/{SERVICE_VERSION}. So for example, bigtable would be gcloud-node-bigtable/0.3.1.

/cc @callmehiphop @stephenplusplus

[theacodes]

google-api-python client uses google-api-python-client/{version} (gzip), we should use similar:

google-cloud-python-{service}/{version} ({transport})

transport could, for example, be grpc, protobuf-over-http, json.

[dhermes]

@jonparrott See https://github.com/GoogleCloudPlatform/gcloud-common/issues/179#issuecomment-244605266 and https://github.com/GoogleCloudPlatform/gcloud-common/issues/179#issuecomment-244967800

[tseaver]

Should we update the USER_AGENT header to include the new __version__ headers added in #3046?