feat(overview): timeline-first landing — event feed, project overview, guided actions (UX P2)#78
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…, guided actions (UX P2)
- event_feed.py: deterministic event rules over per-(service, signature)
time buckets — begins / spike / subsides / new_pattern / health
transitions. Pure rule engine, no LLM cost per load; 15 unit tests.
- GET /projects/{id}/overview: events + corpus-wide signature clusters
(the un-deferred Path B) + services + derived suggested actions.
Window anchors to now and falls back to the project's latest data so
the landing page always tells the most recent story available.
- UI: ProjectPicker (0 projects -> create, 1 -> auto-select, 2+ -> cards)
replaces the empty-chat hero; ProjectOverview renders the timeline,
clusters, services and suggested-action chips as the landing panel;
chips route to Deep Research (grounded query: signature + service +
time range pre-filled) or /chat; sidebar shows per-conversation
project badges; chat + investigate carry the conversation's project.
Verified live on real LogHub data: Infra overview shows 'zookeeper enters
degraded state -> recovers' with clusters and 5 action chips; clicking an
Investigate chip ran a scoped DR investigation end-to-end. 6/6 puppeteer
flows pass against the new flow.
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Second of three stacked PRs for the AI-Observability-Assistant redesign. Stacked on #77 — merge that first.
The new flow
Project selected → timeline loaded → error clusters → suggested actions → user picks an investigation. No empty chat screen.
What this adds
repi/retrieval/event_feed.py): deterministic rules over per-(service, signature) time buckets — begins, spike (×N), subsides, new pattern, and per-service degraded/recovers health transitions. Pure rule engine (15 unit tests, no DB needed), zero LLM cost per timeline load.GET /projects/{id}/overview: events + corpus-wide signature clusters (un-defers the "Path B" noted in cluster_view.py) + services + derived suggested actions. The window anchors to now and falls back to the project's latest data when idle/historical (anchored_to_latest), so the landing always tells the most recent story available.ProjectPicker(0 projects → inline create, 1 → auto-select, 2+ → cards) replaces the empty-chat hero;ProjectOverviewis the landing panel — narrative timeline, clusters, services row, suggested-action chips. Investigate chips launch Deep Research with a grounded query (signature + service + time range pre-filled); chat chips go through /chat. Sidebar shows per-conversation project badges.Verified live (real LogHub Zookeeper data)
Overview renders "zookeeper enters degraded state → zookeeper recovers" with 3 clusters (77×/2×/1×) and 5 action chips; clicking an Investigate chip ran a project-scoped Deep Research investigation end-to-end. 6/6 puppeteer flows pass against the new landing flow (including a fresh full DR run).
Test plan
uv run pytest tests/ -q— 231 passed (15 new event-feed rule tests)npx tsc --noEmitclean