Add product version to the Prometheus Metrics endpoing

[robotdan]

Add product version to the Prometheus Metrics endpoing

Problem

It may be useful to have the product version in the Prometheus output. We currently do return in the Status API response which in general has the same content.

Solution

Add the product version to the prometheus response.

Example response:

# HELP fusionauth_version The FusionAuth product version.
# TYPE fusionauth_version untyped
fusionauth_version 1.0.0

Alternatives/workarounds

Call the Status or Version API

• /api/status
• /api/system/version

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[robotdan]

Internal:

• https://github.com/FusionAuth/fusionauth-app/pull/447

[robotdan]

Decided not to make this change. The existing locations to retrieve the version are reasonable, and this didn't seem to be the best way to add it to the Prometheus exporter since all values are really intended to be floats.