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frontend-session-rca

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Diagnoses a Grafana Frontend Observability (RUM) session: whether it is healthy, what went wrong, ranked problems with timestamps and evidence, likely cause, how to fix it. Optional follow-up: zoom in on the top error, impact across sessions, Session Replay, or a Tempo trace if the user asks. Fetches telemetry with `gcx frontend sessions get --save` and reads only that dump file. Use when the user asks to explain, diagnose, analyse, RCA, or review a session; asks if a session is healthy; pastes Frontend Observability session context (app id, session id, datasource UID); or mentions Faro, user journey, Core Web Vitals, exceptions, ANR, or a web or mobile RUM session — even if they do not say "session narrator" or "frontend-session-rca". Do not use this skill to instrument an app (Faro Web, React Native, Flutter, native OpenTelemetry) — use `app-observability` for Faro Web setup instead.

skills/grafana-cloud/frontend-session-rca/SKILL.md

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Nov 9, 2026
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Apache-2.0

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# Frontend Observability session RCA

Diagnose one real-user session from a `gcx` dump. First answer is dump-only. Do not invent LogQL, SQL, or Explore URLs. Do not instrument SDKs here.

## 1. Collect identity

Required — do **not** fetch until all three are present:

- **app id**: `<app_id>`
- **session id**: `<session_id>`
- **datasource UID** (`-d`): `<datasource_uid>` — Grafana datasource UID, not `loki` or `pinot`

Optional:
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