fix(core): publish readiness after agent load

[nickhuo]

Summary

• keep each local controller in starting until its declared agent has loaded
• publish failed when a declared agent cannot load while preserving agentless controller behavior
• make heartbeats and metrics republish the controller's current status instead of a literal healthy
• keep proxy-start failures terminal and remove the inaccurate "reported healthy" initialization log

Why

LocalController previously published healthy before _load_agent() ran. Its metrics heartbeat also rewrote the status to healthy every interval. A container whose agent failed to import could therefore be counted as ready, and a later mark_failed() would be resurrected by the next heartbeat.

This PR makes the readiness signal truthful. It intentionally does not change GlobalController._wait_for_healthy() semantics: a failed controller is no longer counted as ready, but deploy still waits until its existing timeout and warns rather than exiting non-zero. That downstream policy can be changed separately.

Summary by CodeRabbit

• New Features

  • Controller readiness now reports clear starting, healthy, or failed states.
  • Status updates are published through health checks and monitoring metrics.
  • Controllers can start without publishing readiness until explicitly marked ready.

• Bug Fixes

  • Controllers now correctly report failure when the LLM proxy or configured agent cannot start.
  • Failed status is preserved during subsequent heartbeat and metrics updates.
  • Healthy status is reported for successfully loaded agents and agentless controllers.

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• packages/core/canyonos_core/controller/local_controller.py
• packages/core/tests/test_local_controller_readiness.py

🚧 Files skipped from review as they are similar to previous changes (2)

• packages/core/canyonos_core/controller/local_controller.py
• packages/core/tests/test_local_controller_readiness.py

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📝 Walkthrough

Walkthrough

LocalController now tracks readiness status, handles proxy and agent load failures, and publishes current status values through Redis and metrics. Tests cover healthy, failed, and starting states.

Changes

Controller readiness status

Layer / File(s)	Summary
Initialization and readiness publication packages/core/canyonos_core/controller/local_controller.py, packages/core/tests/test_local_controller_readiness.py	LocalController accepts publish_ready, stores its current status, handles proxy startup failure, and publishes status based on agent loading. Tests cover healthy, failed, and starting states.
Status propagation through metrics packages/core/canyonos_core/controller/local_controller.py, packages/core/tests/test_local_controller_metrics.py	Metrics and periodic status refreshes use the controller’s current status. Test doubles now include _status, and readiness tests verify failed status persistence in metrics.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~12 minutes

Change: Bug fix

Sequence Diagram(s)

sequenceDiagram
  participant LocalController
  participant AgentLoader
  participant Redis
  participant MetricsLoop
  LocalController->>AgentLoader: Load configured agent
  AgentLoader-->>LocalController: Agent or None
  LocalController->>Redis: Publish readiness status
  MetricsLoop->>LocalController: Read current status
  MetricsLoop->>Redis: Refresh status and metrics

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Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 12.50% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 24 functions across 3 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly describes the main change: publishing controller readiness after agent loading. It is concise and specific.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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Actionable comments posted: 1

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Inline comments:
In `@packages/core/canyonos_core/controller/local_controller.py`:
- Line 138: Update the readiness condition in the controller initialization flow
to treat either self.agent_name or self.agent_file as declared agent
configuration when self.agent is None, so partial configuration calls
mark_failed() rather than mark_ready().

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📒 Files selected for processing (3)

• packages/core/canyonos_core/controller/local_controller.py
• packages/core/tests/test_local_controller_metrics.py
• packages/core/tests/test_local_controller_readiness.py

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[Saaketh0]

The direction here is right, and routing _collect_metrics/_metrics_loop through self._status is the correct fix for the heartbeat resurrecting a failed controller. Two things before this goes in — the first is in scope and I think blocking, the second is a pre-existing issue you're welcome to leave for a follow-up.

1. starting is never actually written at init

__init__ sets self._status = "starting" in memory, but nothing publishes it — the first time starting reaches Redis is the first heartbeat tick, which test_heartbeat_before_readiness_publishes_starting confirms is the intended path.

That matters because the status key has no TTL and is never deleted: InstanceManager.remove_instance (instance_manager.py:158) drops agent_instance:{id} but leaves controller:{host}:{port}:status behind. So for a replica restarting on the same host:port, the previous process's healthy is what's in Redis for the whole startup window. The old code overwrote it immediately (with a value that was often a lie, but it did overwrite); this version leaves it standing until _metrics_interval elapses — and that's CANYONOS_POLL_INTERVAL, default 5s, the same cadence _wait_for_healthy polls at (global_controller.py:567).

Net effect: deploy can read a stale healthy and declare a container ready before its agent has loaded, which is the failure this PR is trying to remove. Publishing starting from __init__ when publish_ready (rather than waiting for the heartbeat) closes it and matches what the PR description says it does.

Minor, related: test_publish_ready_false_does_not_write_status is misnamed after this change — the heartbeat does write starting to the key.

2. stop() can still be undone by the heartbeat (pre-existing)

self._metrics_stop_event.set()
self._metrics_thread.join(timeout=2)
...
self.redis.set(self._status_key, "stopped")

stop() writes "stopped" straight to Redis instead of going through self._status, and that 2s join can time out with a tick in flight. If it does, the loop's next iteration republishes self._status over "stopped" — the same resurrection bug this PR fixes for mark_failed(), left open for shutdown.

To be clear this is not something this PR introduced: pre-change _metrics_loop wrote a literal "healthy", so the same overwrite was possible. But since you're already generalizing that exact line, setting self._status = "stopped" here instead of the raw set would finish the job in one place. Happy for it to be a follow-up if you'd rather keep the diff tight.

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For what it's worth, I checked the rest and it holds up: _load_agent swallows every exception and returns None (local_controller.py:294), so the self.agent is None check is a reliable failure signal, and GlobalController treats any status != healthy as unhealthy (:728), so starting needs no downstream handling. Agree with leaving _wait_for_healthy semantics alone.

[userAugustos]

Heads up: main already covers this since #163. LocalController now keeps a _ready event under _status_lock; the heartbeat republishes healthy only while _ready is set, a declared agent that fails to load calls mark_failed() and raises, and mark_failed clears _ready. That is the same guarantee this PR adds with the _status string, which is why the branch now shows as conflicting. #196 adds the remaining bits on top of main's version: logger.exception in _load_agent, killing the proxy when the agent cannot load, and a mark_stopped that clears _ready. I think this can be closed.