How to write/develop you own custom exporters

[Satya Prakash]

Dear All,

Request you to help me for developing custom exporters.

 1. Any reference link?

 2. Any tutorial (freely available on web)?

 3. Step by step verified documents, will also be fine.

I want to write custom  exporters like 

a. node_exporter (where I can update whenever team need some different monitoring values),

 b. publish application monitoring results, it can be like an output file reading and storing values in tsdb.

c. monitoring any custom sql script results.

I look forward to hearing from you as soon as possible.

[sayf.eddi...@gmail.com]

Hello,
1- start by reading the guidelines and best practices from Prometheus website https://prometheus.io/docs/instrumenting/writing_exporters/

Then check the Python prometheus_client (used to write exporters) which is the best entry-level tool you can use
2- Before you start writing an exporter always check if there is one doing the same (don't reinvent the wheel), for example, your b) point, if you want to export metrics from a file there are mtail and grok_exporter.

3- ephemeral jobs (like running an SQL script) cannot monitored directly by Prometheus, you need to check https://prometheus.io/docs/practices/pushing/ and the tool https://github.com/prometheus/pushgateway

[Brian Candler]

Also don't forget the node_exporter textfile collector: you can simply write prometheus metrics into a file, either from a one-time script or a regular cronjob.