How to use the Prometheus to monitor existing projects?

[guxia]

If I want to monitor some of the errors 、page views、
access errors、the amount online users、the amount of access failure or some other on an existing project of java。Need i to add the corresponding code in an existing project line by line？Or how else?

[fabxc]

Essentially yes.

If the project already exports those statistics in other ways you can also write an exporter if you don't want to touch the code.

https://prometheus.io/docs/instrumenting/exporters/

[grobie]

Depending on your existing project, the https://github.com/prometheus/jmx_exporter might also be interesting here.

[lock]

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