Tie extension metrics to host entity

jordan_rose — Mon, 14 Apr 2025 23:35:39 GMT

How can I tie prometheus extension metrics to a host entity? I have looked at tons of examples and cant seem to figure this out.

The goal is to display the collected metrics on a specific host's unified analysis screen. The chart gets displayed but it is filtered for the host so it doesn't show any metrics.

I am in the beginning stages of figuring this out so any help is greatly appreciated!

Example of yaml -

name: custom:promethius.genai.extension version: 0.0.13 minDynatraceVersion: "1.307.0" author: name: JR prometheus: - group: metrics metrics: - key: go_gc_cycles_automatic_gc_cycles_total.count value: metric:go_gc_cycles_automatic_gc_cycles_total type: count metrics: - key: go_gc_cycles_automatic_gc_cycles_total.count metadata: displayName: Go Gc Cycles Automatic Gc Cycles Total description: Count of completed GC cycles generated by the Go runtime. unit: Unspecified screens: - entityType: HOST detailsInjections: - type: CHART_GROUP key: genai_metrics conditions: - entityAttribute|detectedName=hostname.domain.com chartsCards: - key: genai_metrics mode: NORMAL displayName: Metrics Scraped from hostname:port/metrics numberOfVisibleCharts: 1 charts: - displayName: GO GC Metrics visualizationType: GRAPH_CHART graphChartConfig: metrics: - metricSelector: go_gc_cycles_automatic_gc_cycles_total.count

Re: Tie extension metrics to host entity

JamesKitson — Wed, 23 Apr 2025 15:08:30 GMT

This line looks odd to me:

- entityAttribute|detectedName=hostname.domain.com

There shouldn't be any reason to include conditions for a hardcoded name. If you want to ensure that this card is only displayed on hosts with data there are better conditions e.g this one to filter to only hosts that had this metric.

- metricAvailable|metric=go_gc_cycles_automatic_gc_cycles_total.count:filter(in("dt.entity.host", entitySelector("entityId($(entityId))")))|lastWrittenWithinDays=5

Assuming you're doing the 'local' activation (i.e. running from the OA host not an ActiveGate) the host dimensions are added automatically which is what 'ties' them to a host. You shouldn't need to do anything else.

Do you see this (with the Host entity as a populated dimension) in the Data Explorer? If that is there it should satisfy the requirements to be displayed.

topic Tie extension metrics to host entity in Extensions

Tie extension metrics to host entity

Re: Tie extension metrics to host entity