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:
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
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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