telegraf/plugins/inputs/cloud_pubsub/README.md

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# Google Cloud PubSub Input Plugin
The GCP PubSub plugin ingests metrics from [Google Cloud PubSub][pubsub]
and creates metrics using one of the supported [input data formats][].
### Configuration
```toml
[[inputs.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.
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# credentials_file = "path/to/my/creds.json"
## Optional. Maximum byte length of a message to consume.
## Larger messages are dropped with an error. If less than 0 or unspecified,
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## treated as no limit.
# max_message_len = 1000000
## Optional. Maximum messages to read from PubSub that have not been written
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## to an output. Defaults to %d.
## For best throughput set based on the number of metrics within
## each message and the size of the output's metric_batch_size.
##
## For example, if each message contains 10 metrics and the output
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## metric_batch_size is 1000, setting this to 100 will ensure that a
## full batch is collected and the write is triggered immediately without
## waiting until the next flush_interval.
# 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
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## 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.
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## 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.
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## 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
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## processed concurrently (use "max_outstanding_messages" instead).
# max_receiver_go_routines = 0
```
### 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][pubsub create sub].
Each plugin agent can listen to one subscription at a time, so you will
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need to run multiple instances of the plugin to pull messages from multiple
subscriptions/topics.
[pubsub]: https://cloud.google.com/pubsub
[pubsub create sub]: https://cloud.google.com/pubsub/docs/admin#create_a_pull_subscription
[input data formats]: /docs/DATA_FORMATS_INPUT.md