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fix(worker): harden control-plane lifecycle
- reconnect safely after token rotation and retry leased results
- reject malformed tasks and remove production cluster debug mutation
- validate environment files and require immutable container images

BREAKING CHANGE: Docker install, deploy, and Compose now require an
immutable repository@sha256 image reference.
2026-07-19 23:11:43 +03:00

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# Changelog
## 2026-07-19
### Standalone installation and deployment
- Added `rsmon-worker install` for installing the current binary, a mode-0600
environment file, and a root-owned systemd service.
- Added `rsmon-worker deploy` for installing workers over SSH with key or
password authentication, optional secret files, and host-key verification
through `known_hosts` or a pinned fingerprint.
- Added `--token-file`, `--url`, `--api-key`, and `--no-start` deployment
options.
- Added optional `--docker` deployment using a prebuilt image. Docker install
and deploy now require an immutable `repository@sha256:...` reference before
any Docker or remote-host mutation; the former mutable `latest` default is no
longer accepted.
- Simplified the default systemd service to `Type=simple`, `User=root`, and
`Restart=on-failure`.
- Reworked the legacy `scripts/install-systemd.sh` script as a compatibility
wrapper around the built-in installer.
### Standalone repository cleanup
- Removed the remaining certificate-bundle fallback under `/data/rsmon` and
updated its documentation.
- Changed Docker build and runtime bases to public Go and Debian images.
- Documented binary, systemd, Docker, and SSH deployment workflows.
- Added installer and SSH host-verification tests.
### Verification
- Passed `make test`, `make build`, `go vet`, and `go mod verify`.
- Validated systemd units, Compose configuration, Docker image pull and
execution, and production worker job reporting.
- Published the changes as commit `3256dcd` (`feat: add worker install and
deploy`) on `master`, triggering the Docker image workflow.
### Task protocol and local audit hardening
- Required one task-envelope branch, matching outer/inner job IDs, and a
non-empty lease token before local execution.
- Added structured terminal failures for unsupported check kinds and safely
attributable malformed envelopes.
- Recorded delegated notification outcomes in the bounded `/notifications`
view using only job ID, method, status, duration, and time.
- Added static permanent handling for invalid deadlines and recovered
notification executor panics without retaining secret-bearing text.
- Removed the critical-cluster test-config endpoint, CLI flag, environment
switch, and production helper; hardcoded config application is test-only.
- Made runner token rotation connection-scoped and in-memory: it reconnects
without stopping web, inventory, metrics, or cluster subsystems. Durable token
storage, bootstrap exchange, rotation acknowledgement, and revocation remain
unimplemented.
- Added bounded resend of dequeued check and notification result envelopes after
websocket reconnect; control-plane application remains at-least-once and must
deduplicate by leased job and lease token. Failed metric snapshots are dropped
and replaced by the next periodic tick, not replayed.
- SIGTERM stops new dispatch and waits for active work, but stale-lease
acknowledgement, bounded graceful final-result drain, and duplicate-frame
coverage remain open.