feat(operations): add runtime work status contract

src/govoplan_core/core/modules.py

@@ -15,7 +15,10 @@ from govoplan_core.core.views import ViewSurface
 
 if TYPE_CHECKING:
     from fastapi import APIRouter
-    from govoplan_core.core.operations import OperationalCheckProviderRegistration
+    from govoplan_core.core.operations import (
+        OperationalCheckProviderRegistration,
+        RuntimeWorkStatusProviderRegistration,
+    )
     from govoplan_core.core.search import (
         SearchProviderRegistration,
         SearchSourceProviderRegistration,
@@ -502,6 +505,10 @@ class ModuleManifest:
         "OperationalCheckProviderRegistration",
         ...,
     ] = ()
+    runtime_work_status_providers: tuple[
+        "RuntimeWorkStatusProviderRegistration",
+        ...,
+    ] = ()
     architecture: ModuleArchitectureDeclaration | None = None
     information_governance: ModuleInformationGovernance = field(
         default_factory=ModuleInformationGovernance

src/govoplan_core/core/operations.py

@@ -1,7 +1,8 @@
 from __future__ import annotations
 
-from collections.abc import Callable, Mapping
+from collections.abc import Callable, Mapping, Sequence
 from dataclasses import dataclass, field
+from datetime import datetime
 from typing import Literal
 
 
@@ -42,3 +43,84 @@ class OperationalCheckProviderRegistration:
     provider: OperationalCheckProvider
     cache_seconds: int = 60
 
+
+RuntimeWorkState = Literal[
+    "disabled",
+    "unconfigured",
+    "starting",
+    "healthy",
+    "idle",
+    "busy",
+    "degraded",
+    "stale",
+    "unreachable",
+]
+
+
+@dataclass(frozen=True, slots=True)
+class RuntimeWorkStatusContext:
+    """Sanitized process evidence supplied to a runtime-work provider."""
+
+    profile: str
+    observed_at: datetime
+    stale_after_seconds: int
+    runtime_nodes: Sequence[Mapping[str, object]] = ()
+
+
+@dataclass(frozen=True, slots=True)
+class RuntimeWorkStatus:
+    """Bounded worker/queue status with explicit unsupported metrics."""
+
+    provider_id: str
+    label: str
+    backend: str
+    enabled: bool
+    configured: bool
+    state: RuntimeWorkState
+    detail: str
+    observed_at: datetime
+    active_workers: int | None = None
+    last_heartbeat_at: datetime | None = None
+    queue_depths: Mapping[str, int | None] = field(default_factory=dict)
+    active_work: int | None = None
+    reserved_work: int | None = None
+    failures: int | None = None
+    stale_after_seconds: int | None = None
+    guidance: str = ""
+
+    def as_dict(self) -> dict[str, object]:
+        return {
+            "provider_id": self.provider_id,
+            "label": self.label,
+            "backend": self.backend,
+            "enabled": self.enabled,
+            "configured": self.configured,
+            "state": self.state,
+            "detail": self.detail,
+            "observed_at": self.observed_at.isoformat(),
+            "active_workers": self.active_workers,
+            "last_heartbeat_at": (
+                self.last_heartbeat_at.isoformat()
+                if self.last_heartbeat_at is not None
+                else None
+            ),
+            "queue_depths": dict(self.queue_depths),
+            "active_work": self.active_work,
+            "reserved_work": self.reserved_work,
+            "failures": self.failures,
+            "stale_after_seconds": self.stale_after_seconds,
+            "guidance": self.guidance,
+        }
+
+
+RuntimeWorkStatusProvider = Callable[[RuntimeWorkStatusContext], RuntimeWorkStatus]
+
+
+@dataclass(frozen=True, slots=True)
+class RuntimeWorkStatusProviderRegistration:
+    """Register one optional provider-neutral worker/queue observation."""
+
+    module_id: str
+    provider_id: str
+    provider: RuntimeWorkStatusProvider
+    cache_seconds: int = 15

src/govoplan_core/core/registry.py

@@ -640,6 +640,7 @@ class PlatformRegistry:
         permissions = _collect_manifest_permissions(ordered)
         _validate_public_frontend_route_uniqueness(ordered)
         _validate_presentation_catalog(ordered)
+        _validate_runtime_work_provider_uniqueness(ordered)
         _validate_interface_closure(ordered)
         _validate_role_template_scopes(ordered, known_scopes=set(permissions))
 
@@ -692,6 +693,34 @@ class PlatformRegistry:
         return (self._manifests[module_id] for module_id in ordered)
 
 
+def _validate_runtime_work_provider_uniqueness(
+    manifests: tuple[ModuleManifest, ...],
+) -> None:
+    owners: dict[str, str] = {}
+    for manifest in manifests:
+        for registration in manifest.runtime_work_status_providers:
+            if registration.module_id != manifest.id:
+                raise RegistryError(
+                    f"Runtime-work provider {registration.provider_id!r} belongs to "
+                    f"{registration.module_id!r}, not module {manifest.id!r}"
+                )
+            if not _QUICK_ACCESS_TOOL_ID_RE.fullmatch(registration.provider_id):
+                raise RegistryError(
+                    f"Invalid runtime-work provider id: {registration.provider_id!r}"
+                )
+            if registration.cache_seconds < 1:
+                raise RegistryError(
+                    f"Runtime-work provider {registration.provider_id!r} must cache for at least one second"
+                )
+            previous = owners.get(registration.provider_id)
+            if previous is not None:
+                raise RegistryError(
+                    f"Duplicate runtime-work provider {registration.provider_id!r} in modules "
+                    f"{previous!r} and {manifest.id!r}"
+                )
+            owners[registration.provider_id] = manifest.id
+
+
 def manifest_view_surfaces(manifest: ModuleManifest) -> tuple[ViewSurface, ...]:
     frontend = manifest.frontend
     if frontend is None:

src/govoplan_core/core/runtime_work.py

@@ -0,0 +1,258 @@
+from __future__ import annotations
+
+from collections.abc import Callable, Mapping
+from datetime import datetime
+from typing import Any
+
+from govoplan_core.core.operations import (
+    RuntimeWorkState,
+    RuntimeWorkStatus,
+    RuntimeWorkStatusContext,
+)
+from govoplan_core.settings import settings
+
+
+QueueDepthReader = Callable[[list[str]], Mapping[str, int | None]]
+
+
+def celery_runtime_work_status(context: RuntimeWorkStatusContext) -> RuntimeWorkStatus:
+    """Observe the built-in Celery backend without exposing it to Ops."""
+
+    queues = _configured_queues()
+    backend_configured = bool(str(settings.redis_url or "").strip())
+    if not settings.celery_enabled:
+        return _status(
+            context,
+            enabled=False,
+            configured=backend_configured,
+            state="disabled",
+            detail="Background workers are intentionally disabled.",
+            active_workers=0,
+            queue_depths={queue: None for queue in queues},
+            active_work=0,
+            reserved_work=0,
+            guidance=(
+                "Synchronous development paths may be used in development. "
+                "Enable and monitor workers before production queue-backed work."
+                if context.profile in {"development", "local-dev"}
+                else "Enable a worker backend before accepting queue-backed work."
+            ),
+        )
+    if not backend_configured or not queues:
+        return _status(
+            context,
+            enabled=True,
+            configured=False,
+            state="unconfigured",
+            detail="Background workers are enabled but their backend or queue list is not configured.",
+            queue_depths={queue: None for queue in queues},
+            guidance="Configure the broker and an explicit queue list, then start the required worker pools.",
+        )
+
+    try:
+        from govoplan_core.celery_app import celery
+
+        inspector = celery.control.inspect(timeout=0.75)
+        return collect_celery_runtime_work_status(
+            context,
+            inspector=inspector,
+            queues=queues,
+            queue_depth_reader=_redis_queue_depths,
+        )
+    except Exception:  # noqa: BLE001 - status must isolate and sanitize provider failures.
+        return _status(
+            context,
+            enabled=True,
+            configured=True,
+            state="unreachable",
+            detail="The configured worker backend did not return bounded status evidence.",
+            queue_depths={queue: None for queue in queues},
+            guidance="Verify broker reachability and worker processes; do not infer health from missing metrics.",
+        )
+
+
+def collect_celery_runtime_work_status(
+    context: RuntimeWorkStatusContext,
+    *,
+    inspector: Any,
+    queues: list[str],
+    queue_depth_reader: QueueDepthReader,
+) -> RuntimeWorkStatus:
+    replies = inspector.ping() or {}
+    if not isinstance(replies, Mapping) or not replies:
+        state = "starting" if _fresh_worker_nodes(context) else "unreachable"
+        return _status(
+            context,
+            enabled=True,
+            configured=True,
+            state=state,
+            detail=(
+                "Worker processes are starting but have not answered the bounded status probe."
+                if state == "starting"
+                else "No configured worker answered the bounded status probe."
+            ),
+            active_workers=0,
+            queue_depths={queue: None for queue in queues},
+            guidance="Wait for startup or verify worker and broker connectivity.",
+        )
+
+    active_queues_by_worker = inspector.active_queues() or {}
+    active_by_worker = inspector.active() or {}
+    reserved_by_worker = inspector.reserved() or {}
+    active_queues = sorted(
+        {
+            str(queue.get("name"))
+            for worker_queues in active_queues_by_worker.values()
+            if isinstance(worker_queues, list)
+            for queue in worker_queues
+            if isinstance(queue, Mapping) and queue.get("name")
+        }
+    )
+    missing_queues = sorted(set(queues) - set(active_queues))
+    active_work = _task_count(active_by_worker)
+    reserved_work = _task_count(reserved_by_worker)
+    try:
+        measured_depths = dict(queue_depth_reader(queues))
+    except Exception:  # noqa: BLE001 - queue depth remains explicitly unsupported.
+        measured_depths = {}
+    queue_depths = {
+        queue: _bounded_count(measured_depths.get(queue)) for queue in queues
+    }
+    known_depth = sum(value for value in queue_depths.values() if value is not None)
+    worker_nodes = _worker_nodes(context)
+    stale_nodes = [node for node in worker_nodes if node.get("stale") is True]
+    latest_heartbeat = _latest_heartbeat(worker_nodes)
+
+    if stale_nodes and len(stale_nodes) >= len(worker_nodes) > 0:
+        state = "stale"
+        detail = "All registered worker heartbeats are stale."
+        guidance = "Restore worker heartbeats or replace the stale worker incarnations."
+    elif missing_queues or stale_nodes:
+        state = "degraded"
+        detail = "Worker status is partial: a queue lacks a consumer or a registered worker is stale."
+        guidance = "Restore the missing queue consumers and investigate stale worker heartbeats."
+    elif active_work + reserved_work + known_depth > 0:
+        state = "busy"
+        detail = "Workers are processing or waiting to process queued work."
+        guidance = "Monitor queue age and failures; scale only within configured provider limits."
+    elif all(value is not None for value in queue_depths.values()):
+        state = "idle"
+        detail = "Workers are available and all measured queues are empty."
+        guidance = "No action is required."
+    else:
+        state = "healthy"
+        detail = "Workers answered and cover all configured queues; queue depth is unavailable."
+        guidance = "Treat queue depth as unavailable, not empty."
+
+    return _status(
+        context,
+        enabled=True,
+        configured=True,
+        state=state,
+        detail=detail,
+        active_workers=len(replies),
+        last_heartbeat_at=latest_heartbeat,
+        queue_depths=queue_depths,
+        active_work=active_work,
+        reserved_work=reserved_work,
+        guidance=guidance,
+    )
+
+
+def _status(
+    context: RuntimeWorkStatusContext,
+    *,
+    enabled: bool,
+    configured: bool,
+    state: RuntimeWorkState,
+    detail: str,
+    active_workers: int | None = None,
+    last_heartbeat_at: datetime | None = None,
+    queue_depths: Mapping[str, int | None] | None = None,
+    active_work: int | None = None,
+    reserved_work: int | None = None,
+    guidance: str,
+) -> RuntimeWorkStatus:
+    return RuntimeWorkStatus(
+        provider_id="core.celery",
+        label="Background workers",
+        backend="Celery",
+        enabled=enabled,
+        configured=configured,
+        state=state,
+        detail=detail,
+        observed_at=context.observed_at,
+        active_workers=active_workers,
+        last_heartbeat_at=last_heartbeat_at,
+        queue_depths=queue_depths or {},
+        active_work=active_work,
+        reserved_work=reserved_work,
+        failures=None,
+        stale_after_seconds=context.stale_after_seconds,
+        guidance=guidance,
+    )
+
+
+def _configured_queues() -> list[str]:
+    return sorted(
+        {
+            item.strip()
+            for item in str(settings.celery_queues or "").split(",")
+            if item.strip()
+        }
+    )
+
+
+def _redis_queue_depths(queues: list[str]) -> Mapping[str, int | None]:
+    from redis import Redis
+
+    client = Redis.from_url(
+        settings.redis_url,
+        socket_connect_timeout=0.75,
+        socket_timeout=0.75,
+    )
+    pipeline = client.pipeline(transaction=False)
+    for queue in queues:
+        pipeline.llen(queue)
+    values = pipeline.execute()
+    return {
+        queue: _bounded_count(value)
+        for queue, value in zip(queues, values, strict=True)
+    }
+
+
+def _task_count(tasks_by_worker: object) -> int:
+    if not isinstance(tasks_by_worker, Mapping):
+        return 0
+    return sum(
+        len(tasks) for tasks in tasks_by_worker.values() if isinstance(tasks, list)
+    )
+
+
+def _bounded_count(value: object) -> int | None:
+    if isinstance(value, bool) or not isinstance(value, int | float):
+        return None
+    return max(0, int(value))
+
+
+def _worker_nodes(context: RuntimeWorkStatusContext) -> list[Mapping[str, object]]:
+    return [node for node in context.runtime_nodes if node.get("role") == "worker"]
+
+
+def _fresh_worker_nodes(context: RuntimeWorkStatusContext) -> list[Mapping[str, object]]:
+    return [node for node in _worker_nodes(context) if node.get("stale") is not True]
+
+
+def _latest_heartbeat(nodes: list[Mapping[str, object]]) -> datetime | None:
+    values: list[datetime] = []
+    for node in nodes:
+        raw = node.get("last_heartbeat_at")
+        if isinstance(raw, datetime):
+            values.append(raw)
+            continue
+        if isinstance(raw, str):
+            try:
+                values.append(datetime.fromisoformat(raw.replace("Z", "+00:00")))
+            except ValueError:
+                continue
+    return max(values) if values else None