[Feature Request] Prometheus metrics handling

[asachs01]

As a Sensu operator who's standardized our time series metric data collection on the Prometheus platform, I'd like to be able to take metrics from Sensu checks generating prometheus_text formatted metrics and send them back into Prometheus for graphing and visualization.

[asachs01]

cc @calebhailey & @sensu/customer-engineering for later discussion

[calebhailey]

Ideally it would be good if we could first implement a more robust integration between Sensu and Prometheus than a pipe handler; perhaps something like the new pipeline/v1.SumoLogicMetricsHandler (streaming metrics handler w/ persistent connections). We've been talking for some time about exploring the remote-write-receiver in Prometheus 2.25+, which might be a good approach for this.

Related:

• Prometheus Push Gateway Handler for Sensu Go (GitHub)
• Prometheus reference architecture for the Sensu Go Workshop