feat(awooop): add source provider freshness heartbeat

apps/api/src/services/channel_hub.py

@@ -85,6 +85,7 @@ def build_inbound_source_envelope(
     content_sha256 = hashlib.sha256(raw_content.encode()).hexdigest() if raw_content else None
     text_refs = _INCIDENT_ID_RE.findall(raw_content or "")
     provider_name = str(provider or "unknown").strip().lower() or "unknown"
+    is_provider_heartbeat = str(stage or "").strip().lower() == "heartbeat"
     source_refs = {
         "event_ids": _compact_unique([raw_event_id]),
         "incident_ids": _compact_unique([incident_id, *text_refs]),
@@ -92,10 +93,14 @@ def build_inbound_source_envelope(
         "alert_ids": _compact_unique([provider_event_id, raw_event_id]),
         "fingerprints": _compact_unique([fingerprint]),
         "sentry_issue_ids": _compact_unique(
-            [raw_event_id, provider_event_id] if provider_name == "sentry" else []
+            [raw_event_id, provider_event_id]
+            if provider_name == "sentry" and not is_provider_heartbeat
+            else []
         ),
         "signoz_alerts": _compact_unique(
-            [raw_event_id, alertname] if provider_name == "signoz" else []
+            [raw_event_id, alertname]
+            if provider_name == "signoz" and not is_provider_heartbeat
+            else []
         ),
     }
     envelope: dict[str, Any] = {