feat(skills): add instrument-metrics skill family#255
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Adds the metrics sibling of the logs skill family: per-platform variants (Web JavaScript, Node.js, Python, Other Languages) plus an aggregated omnibus/instrument-metrics skill, and a posthog-metrics plugin mapping in marketplace.yaml. The skill teaches agents to add posthog.metrics capture alongside existing Prometheus/StatsD/OTel instrumentation and to add new metrics where they belong, with cardinality and metric-type guidance. Generated-By: PostHog Code Task-Id: 470062dd-05c0-40bf-bfa3-bc89b194121e
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Changes
Adds the metrics sibling of the logs skill family:
context/skills/metrics/— per-platform variants (Web JavaScript, Node.js, Python, Other Languages) sourcing the new/docs/metrics/installation/*pagescontext/skills/omnibus/instrument-metrics/— aggregated all-platforms skill with step-by-step instructions: detect existing metrics instrumentation, addposthog.metricscapture alongside it (never replace), add new metrics where they belong, keep cardinality low, and wire env vars via the MCPprojects-getflowposthog-metricsplugin mapping incontext/marketplace.yamlWhy: metrics is the one observability product missing from the
instrument-*family, so agents asked to "push metrics into PostHog" improvise OTel plumbing instead of using theposthog.metricsSDK APIs that shipped in posthog-js #4115, posthog-node #4117, and posthog-python #739.Depends on
docs_urlspoint at the new installation pages and the build fetches them at generation time (currently 404).Validation
npm test— 136/136 passnpm run buildwith the doc URLs temporarily substituted for live metrics pages: all 5 skills generate (metrics-{javascript,nodejs,python,other},omnibus-instrument-metrics), zips build,posthog-metricsmarketplace plugin renders with correct SKILL.md frontmatter, and entries appear inskill-menu.jsonCreated with PostHog Code