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feat(controller-status): carry election time on the heartbeat (task 7.3)

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The primary echoes its own last_known_elected_at_ms on every outgoing
heartbeat (threaded through xce_ha_heartbeat_req's existing scalar-arg
plumbing, alongside term/committed_lsn/committed_config_tag); a standby
processing a received heartbeat (ha_consume_heartbeat_committed, the sole
production call site) stores it unconditionally into its own
last_known_elected_at_ms, reconcile-free -- no other HA field moves.
ha_observe_heartbeat_committed itself is untouched; the new store sits
next to its call site, not inside it.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01RLSNJhNoULvVcUhXEFafQC
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Rongsong Shen 2026-09-16 06:03:03 +00:00
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.kiro/specs/controller-status/tasks.md
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@ -108,7 +108,7 @@
- _Boundary: promotion (ha_do_promote, raft_cb_become_leader)_
- _Depends: 7.1_
- [ ] 7.3 Carry the primary's election time to standbys over the heartbeat
- [x] 7.3 Carry the primary's election time to standbys over the heartbeat
- TDD (red first): a standby that processes a heartbeat carrying the primary's election time stores it as its own learned election-time and leaves every other learned/produced HA field (committed position, role, term, applied position) untouched (reconcile-free).
- The primary includes its own election time in every heartbeat it sends; a standby that receives a heartbeat stores the carried election time as its learned value.
- Observable: the reconcile-free test passes — only the learned election-time changes, nothing else moves; a live/loopback heartbeat round-trip shows the standby's learned election-time matching the primary's.