Prometheus exporter

An output plugin to expose Prometheus Metrics

The Prometheus exporter lets you take metrics from Fluent Bit and expose them so a Prometheus instance can scrape them.

The Prometheus exporter works only with metric plugins such as Node Exporter Metrics.

Configuration parameters

This plugin supports the following parameters:

Key
Description
Default

host

This is address Fluent Bit will bind to when hosting Prometheus metrics. The listen parameter is deprecated in 1.9.0 and later.

0.0.0.0

port

This is the port Fluent Bit will bind to when hosting Prometheus metrics.

2021

add_label

This lets you add custom labels to all metrics exposed through the Prometheus exporter. You can have multiple of these fields.

none

workers

The number of workers to perform flush operations for this output.

1

Get started

The Prometheus exporter works only with metrics captured from metric plugins. In the following example, host metrics are captured by the node exporter metrics plugin and then are routed to Prometheus exporter. In the output plugin, the labels app="fluent-bit"and color="blue" are added.

# Node Exporter Metrics + Prometheus Exporter
# -------------------------------------------
# The following example collect host metrics on Linux and expose
# them through a Prometheus HTTP end-point.
#
# After starting the service try it with:
#
# $ curl http://127.0.0.1:2021/metrics
#
service:
  flush: 1
  log_level: info

pipeline:
  inputs:
    - name: node_exporter_metrics
      tag:  node_metrics
      scrape_interval: 2

  outputs:
    - name: prometheus_exporter
      match: node_metrics
      host: 0.0.0.0
      port: 2021
      # add user-defined labels
      add_label:
        - app fluent-bit
        - color blue

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