Consider following OpenMetrics guidance on timestamps

[dashpole]

By default, the prometheus exporter appends timestamps to metrics.

This goes against the current guidance from OpenMetrics about whether to expose timestamps.

We should consider not adding timestamps by default.

[github-actions]

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[JacksonWeber]

@dyladan @legendecas Hi, I'd be happy to pick this up!

[pichlermarc]

I think technically, our exporter uses the Prometheus text based exposition format as required by the spec in favor of OpenMetrics, but the same guidance is also present there.

@JacksonWeber thanks for picking this one up, it's yours 🙂