Feedback on /admin/monitoring/prometheus-jmx-exporter.md: Improve usability

[amotl]

Documentation feedback

• Page title: Prometheus JMX Exporter
• Page URL: https://cratedb.com/docs/guide/admin/monitoring/prometheus-jmx-exporter.html
• Source: https://github.com/crate/cratedb-guide/blob/490/docs/admin/monitoring/prometheus-jmx-exporter.md

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This request might sound silly after so many years of existance with the status quo, but improving the enablement of the JMX exporter like this would tremendously enhance usability:

a) Ship the crate-jmx-exporter-1.2.2.jar with the CrateDB distribution packages and its OCI image already, similar like crash and admin-ui are also integrated into the software distribution, to save the manual invocation of wget.

b) Provide a little more concise environment variable for activation, instead of needing to manipulate the full CRATE_JAVA_OPTS, like currently outlined in the documention.

I am primarily looking at making the invocation of CrateDB in container environments much easier, optimally like:

docker run --env JMX_EXPORTER=true docker.io/crate

/cc @WalBeh