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## Summary The relay no longer runs database aggregate queries to emit usage gauges. Fleet and per-community counts of users, channels, relay members, workflows, git repos, communities, messages, and active users/channels are no longer relay metrics, and neither are the snapshot health gauges that came with them. ### Removed - **Gauges:** `buzz_total_users`, `buzz_total_channels`, `buzz_total_relay_members`, `buzz_total_workflows`, `buzz_total_git_repos`, `buzz_total_active_users`, `buzz_total_messages`, `buzz_total_active_channels`, `buzz_communities_estimated` / `buzz_communities_total`, and every DB-derived `buzz_community_*` series (users, channels, messages, relay members, workflows, git repos, active users, active channels). - **Per-community mode:** `BUZZ_USAGE_METRICS_PER_COMMUNITY=all` and everything it fed: the per-community in-memory gauges, `buzz_community_storage_bytes` / `buzz_community_storage_objects`, `buzz_storage_unmapped_community_bytes`, the community → host map query, and the emission-scope bookkeeping that cleared series for renamed or removed communities. No deployment set it. If one still does, the relay ignores it. - **Health signals:** `buzz_usage_snapshot_available`, `buzz_usage_snapshot_age_seconds`, `buzz_usage_query_skipped_total`, and the `usage_fleet_*` paths of `buzz_db_route_decision`. - **Code and config:** - `buzz-db/src/store/usage.rs`, including its aggregate queries. - The relay's `FleetUsageSchedule` and its cadence/deadline/retry machinery. - The replica-only telemetry route (`Db::route_usage_read`). - `BUZZ_USAGE_METRICS_REPLICA_MAX_AGE_MS` and `DbConfig::usage_metrics_replica_max_age_ms`. If a deployment still sets the env var, the relay now ignores it; startup doesn't fail. - **Reader maintenance pool operation:** `ReaderOperation::Maintenance` and its `close_on_drop` release path existed only for those telemetry reads, so they're removed too. The pool-acquire contract drops from twelve to eleven valid pairs, which lowers the per-pod series ceiling from 216 to 198. - **Dead code:** `Db::active_community_hosts` had no callers. ### Kept - **Leader:** the usage poller's leader lock, plus the leader's invite reaping and fleet storage-snapshot gauges. The session advisory lock (`SessionLeader`, `Db::try_lock_session_leader`) moves to `buzz-db/src/store/leader_lock.rs`, since storage-usage delivery uses it too and it has nothing to do with usage queries. - **In-memory gauges:** pod-local connection, subscription, and online-user gauges. They read process state, not the database. - **Writer maintenance pool operation:** `WriterOperation::Maintenance` stays. Dozens of writer-side maintenance paths across `buzz-db` use it (reapers, retention, the leader lock). The reader variant only ever served the telemetry reads. - **Storage-usage delivery:** unchanged. It reads the storage snapshot for billing, not for metrics. `docs/usage-metrics.md`, `docs/storage-accounting.md`, `.env.example`, and the Helm chart README are updated to match. ## What got simpler This is net deletion (~3.6k lines). One telemetry subsystem is gone: two collection families with independent cadences, availability and age semantics, relay-side deadlines, a dedicated replica routing policy, two config knobs, a per-community emission mode, and a pool-operation variant. Leader election now does only leader work, and it lives in its own module. ## Operational note Dashboards and monitors that read the removed series will go to no data once this rolls out. ## Testing - `cargo fmt --check`, workspace `cargo clippy --all-targets -D warnings`. - `buzz-db` lib, `observability_source`, and doc tests. - `buzz-relay` lib tests. - The Postgres lane for `buzz-db` (lib + tests) and `buzz-relay` (lib). All of these run on a remote workstation at the PR head. 🤖 Generated with [Claude Code](https://claude.com/claude-code) --------- Signed-off-by: Luke Tornquist <tornquist@squareup.com> Co-authored-by: Elrond <28d6302a099e5225b02c4155ac4236e4912603df2ab08dbfc2f4fef08ce598c8@buzz.block.builderlab.xyz> Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>