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Google Cloud PubSub Input Plugin

The GCP PubSub plugin ingests metrics from Google Cloud PubSub and creates metrics using one of the supported input data formats.

Service Input

This plugin is a service input. Normal plugins gather metrics determined by the interval setting. Service plugins start a service to listens and waits for metrics or events to occur. Service plugins have two key differences from normal plugins:

  1. The global or plugin specific interval setting may not apply
  2. The CLI options of --test, --test-wait, and --once may not produce output for this plugin

Global configuration options

In addition to the plugin-specific configuration settings, plugins support additional global and plugin configuration settings. These settings are used to modify metrics, tags, and field or create aliases and configure ordering, etc. See the CONFIGURATION.md for more details.

Configuration

# Read metrics from Google PubSub
[[inputs.cloud_pubsub]]
  ## Required. Name of Google Cloud Platform (GCP) Project that owns
  ## the given PubSub subscription.
  project = "my-project"

  ## Required. Name of PubSub subscription to ingest metrics from.
  subscription = "my-subscription"

  ## Required. Data format to consume.
  ## Each data format has its own unique set of configuration options.
  ## Read more about them here:
  ## https://github.com/influxdata/telegraf/blob/master/docs/DATA_FORMATS_INPUT.md
  data_format = "influx"

  ## Optional. Filepath for GCP credentials JSON file to authorize calls to
  ## PubSub APIs. If not set explicitly, Telegraf will attempt to use
  ## Application Default Credentials, which is preferred.
  # credentials_file = "path/to/my/creds.json"

  ## Optional. Number of seconds to wait before attempting to restart the
  ## PubSub subscription receiver after an unexpected error.
  ## If the streaming pull for a PubSub Subscription fails (receiver),
  ## the agent attempts to restart receiving messages after this many seconds.
  # retry_delay_seconds = 5

  ## Optional. Maximum byte length of a message to consume.
  ## Larger messages are dropped with an error. If less than 0 or unspecified,
  ## treated as no limit.
  # max_message_len = 1000000

  ## Max undelivered messages
  ## This plugin uses tracking metrics, which ensure messages are read to
  ## outputs before acknowledging them to the original broker to ensure data
  ## is not lost. This option sets the maximum messages to read from the
  ## broker that have not been written by an output.
  ##
  ## This value needs to be picked with awareness of the agent's
  ## metric_batch_size value as well. Setting max undelivered messages too high
  ## can result in a constant stream of data batches to the output. While
  ## setting it too low may never flush the broker's messages.
  # max_undelivered_messages = 1000

  ## The following are optional Subscription ReceiveSettings in PubSub.
  ## Read more about these values:
  ## https://godoc.org/cloud.google.com/go/pubsub#ReceiveSettings

  ## Optional. Maximum number of seconds for which a PubSub subscription
  ## should auto-extend the PubSub ACK deadline for each message. If less than
  ## 0, auto-extension is disabled.
  # max_extension = 0

  ## Optional. Maximum number of unprocessed messages in PubSub
  ## (unacknowledged but not yet expired in PubSub).
  ## A value of 0 is treated as the default PubSub value.
  ## Negative values will be treated as unlimited.
  # max_outstanding_messages = 0

  ## Optional. Maximum size in bytes of unprocessed messages in PubSub
  ## (unacknowledged but not yet expired in PubSub).
  ## A value of 0 is treated as the default PubSub value.
  ## Negative values will be treated as unlimited.
  # max_outstanding_bytes = 0

  ## Optional. Max number of goroutines a PubSub Subscription receiver can spawn
  ## to pull messages from PubSub concurrently. This limit applies to each
  ## subscription separately and is treated as the PubSub default if less than
  ## 1. Note this setting does not limit the number of messages that can be
  ## processed concurrently (use "max_outstanding_messages" instead).
  # max_receiver_go_routines = 0

  ## Optional. If true, Telegraf will attempt to base64 decode the
  ## PubSub message data before parsing. Many GCP services that
  ## output JSON to Google PubSub base64-encode the JSON payload.
  # base64_data = false

  ## Content encoding for message payloads, can be set to "gzip" or
  ## "identity" to apply no encoding.
  # content_encoding = "identity"

  ## If content encoding is not "identity", sets the maximum allowed size, 
  ## in bytes, for a message payload when it's decompressed. Can be increased 
  ## for larger payloads or reduced to protect against decompression bombs.
  ## Acceptable units are B, KiB, KB, MiB, MB...
  # max_decompression_size = "500MB"

Multiple Subscriptions and Topics

This plugin assumes you have already created a PULL subscription for a given PubSub topic. To learn how to do so, see how to create a subscription.

Each plugin agent can listen to one subscription at a time, so you will need to run multiple instances of the plugin to pull messages from multiple subscriptions/topics.

Metrics

Example Output