rca-analysis

Zava Learning — Root Cause Analysis

Produce the analytical heart of the incident report: a defensible, evidence-backed RCA in the house format. Resource Group: @@RG@@. Services: learner-portal, course-api, assessment-api. Retrieve zava-brand and zava-report-template with SearchMemory and follow the Root cause + Timeline sections of the template.

Gather evidence first (never assert without it)

• Timeline: reconstruct detection → mitigation → durable fix from GetActivityLogsSummary, GetChangeHistory, and the relevant App Insights / Log Analytics queries (QueryAppInsightsByResourceId, QueryLogAnalyticsByResourceId) filtered by the affected cloud_RoleName. Every timeline row cites a source.
• Align the symptom onset to the nearest config/revision/deployment change.

Structure the RCA

1. What happened — the symptom and customer impact in plain language (no cause in the title).

2. Timeline — UTC table: time · event · evidence/source.

3. 5-Whys (MANDATORY, render the ladder) — write an explicit, numbered Why-ladder, not a one-line summary. Start from the student-visible symptom and ask "why?" repeatedly until you reach the latent root cause — typically five steps:

   • Why 1: students saw <symptom> → because <immediate technical effect>
   • Why 2: <effect> → because <misbehaving component/config>
   • Why 3: <component> misbehaved → because <the change/state that caused it>
   • Why 4: that change happened → because <how it got introduced / trigger>
   • Why 5 (latent root cause): it was possible/undetected → because <missing guardrail or gap>

   Each rung cites its evidence. Then state the trigger (what set it off now) separately from the latent cause (the condition that made it possible) — the latent cause is Why 5. Render this ladder in the RCA section; never collapse it to a single trigger/latent two-liner.

4. Contributing factors — gaps in detection, guardrails, or process that widened impact.

5. Why it was hard / easy to detect — informs the detective recommendations.

Presentation rules

• Symptom-only headings; the root cause appears in the body, never in a title.
• The 5-Whys ladder is ALWAYS rendered under a literal 5 Whys heading (### 5 Whys / <h3>5 Whys</h3>) inside the Root Cause section, with five numbered rungs each on its own line (Why 1: … Why 5:). A request-path Mermaid diagram may accompany it but never replaces it.
• Distinguish facts (with evidence) from hypotheses (label clearly).
• Keep it blameless: systems and conditions, not individuals.

Outputs

This skill produces, for the wider investigation: the fault class (connectivity/config/RBAC vs. performance/availability — so evidence-before-after picks the right visual), the confirmed before/after time windows and affected metrics or config state (used by evidence-before-after), the unresolved detection/guardrail gaps (used by recommendations-next-steps), and the finished RCA section (used by zava-reporting). Record them clearly so the agent can use them in whichever skill it runs next.

Verification

The RCA names a specific, evidence-backed root cause; an explicit numbered 5-Whys ladder is rendered (symptom → … → latent cause), not a single trigger/latent two-liner; trigger and latent cause are separated; every timeline entry is sourced; the section matches zava-report-template.