A command-line tool (and Lambda) for collecting Buildkite agent metrics
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Buildkite Agent Metrics

A command-line tool for collecting Buildkite agent metrics, focusing on enabling auto-scaling. Currently AWS Cloudwatch, StatsD and Prometheus are supported.

Build status

Note: Formerly known as buildkite-metrics, but now buildkite-agent-metrics to reflect the focus of the tool.


Either download the latest binary from Github Releases or install with:

go get github.com/buildkite/buildkite-agent-metrics


Several running modes are supported. All of them require an Agent Registration Token, found on the Buildkite Agents page.

Running as a Daemon

The simplest deployment is to run as a long-running daemon that collects metrics across all queues in an organization.

buildkite-agent-metrics -token abc123 -interval 30s

Restrict it to a single queue with -queue if you're scaling a single cluster of agents:

buildkite-agent-metrics -token abc123 -interval 30s -queue my-queue

Running as an AWS Lambda

An AWS Lambda bundle is created and published as part of the build process.

It's entrypoint is handler, it requires a go1.x environment and respects the following env vars:

aws lambda create-function \
  --function-name buildkite-agent-metrics \
  --memory 128 \
  --role arn:aws:iam::account-id:role/execution_role \
  --runtime go1.x \
  --zip-file fileb://handler.zip \
  --handler handler


By default metrics will be submitted to CloudWatch but the backend can be switched to StatsD or Prometheus using the command-line argument -backend statsd or -backend prometheus respectively.

The Cloudwatch backend supports the following arguments:

  • -cloudwatch-dimensions: A optional custom dimension in the form of Key=Value, Key=Value

The StatsD backend supports the following arguments:

  • -statsd-host HOST: The StatsD host and port (defaults to
  • -statsd-tags: Some StatsD servers like the agent provided by Datadog support tags. If specified, metrics will be tagged by queue otherwise metrics will include the queue name in the metric. Only enable this option if you know your StatsD server supports tags.

The Prometheus backend supports the following arguments

  • -prometheus-addr: The local address to listen on (defaults to :8080).
  • -prometheus-path: The path under prometheus-addr to expose metrics on (defaults to /metrics).

Upgrading from v2 to v3

  1. The -org argument is no longer needed
  2. The -token argument is now an Agent Registration Token — the same used in the Buildkite Agent configuration file, and found on the Buildkite Agents page.
  3. Build and pipeline metrics have been removed, focusing on agents and jobs by queue for auto–scaling. If you have a compelling reason to gather build or pipeline metrics please continue to use the previous version or open an issue with details.


This tool is built with Go 1.11+ and Go Modules.

You can build and run the binary tool locally with golang installed:

export GO111MODULE=on
go run *.go -token [buildkite agent registration token]

Currently this will publish metrics to Cloudwatch under the custom metric prefix of Buildkite, using AWS credentials from your environment. The machine will require the cloudwatch:PutMetricData IAM permission.


The following metrics are gathered when no specific queue is supplied:

Buildkite > RunningJobsCount
Buildkite > ScheduledJobsCount
Buildkite > UnfinishedJobsCount
Buildkite > IdleAgentsCount
Buildkite > BusyAgentsCount
Buildkite > TotalAgentsCount

Buildkite > (Queue) > RunningJobsCount
Buildkite > (Queue) > ScheduledJobsCount
Buildkite > (Queue) > UnfinishedJobsCount
Buildkite > (Queue) > IdleAgentsCount
Buildkite > (Queue) > BusyAgentsCount
Buildkite > (Queue) > TotalAgentsCount

When a queue is specified, only that queue's metrics are published.