Add prometheus metrics emitter #187
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The core of this package is a prometheus.Collector implementation that exposes the metrics of an rcrowley/go-metrics registry. It also provides a convenience function for creating a collector, registering it with a Prometheus registry, and exposing it on a HTTP endpoint. If you need to customize any of the Prometheus options, you can use the Collector directly. I ended up writing my own emitter because the existing exporters I found had some limitations: * Don't understand our custom tag/label format * Report at fixed intervals intead of implementing Collector * Export histograms incorrectly
asvoboda
approved these changes
Jul 4, 2023
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Yeah, some basic tests would be good. I started writing some and discovered an issue with the Prometheus testing library, so I'm trying to decide how to best work around that. |
Per https://prometheus.io/docs/instrumenting/writing_exporters/, remove less useful statistics that can be computed in Prometheus, add simple help text to indicate the original metric type, add "seconds" to the names of timer metrics, and improve the santize function to avoid long runs of underscores.
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Updated to add tests. I also made some other changes:
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jamestoyer
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Jul 24, 2023
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The core of this package is a
prometheus.Collectorimplementation that exposes the metrics of anrcrowley/go-metricsregistry. It also provides a convenience function for creating a collector, registering it with a Prometheus registry, and exposing it on a HTTP endpoint. If you need to customize any of the Prometheus options, you can use the Collector directly.I ended up writing my own emitter because the existing exporters I found had some limitations:
CollectorBecause this is a new emitter, I tried to stay closer to Prometheus conventions rather than matching the Datadog emitter. Specifically:
go-metricsterminology0.5quantile instead of as a separate named metricBut I could be convinced it's better to match the Datadog emitter for easier migration.