fix(alerts): state changes are one-shot, icon by target state

src/healthbot/alerts.py

@@ -18,15 +18,16 @@ INFORMATIONAL = frozenset(
 )
 
 FAILURE = frozenset(
-    {
+    {"ProcedureFailed", "ActionFailed", "BuildFailed", "RepoBuildFailed"}
-        "ProcedureFailed",
-        "ActionFailed",
-        "BuildFailed",
-        "RepoBuildFailed",
-    }
 )
 
-ONE_SHOT = INFORMATIONAL | FAILURE
+# Komodo создаёт их сразу с resolved=true (resolved_ts == ts): это факт
+# «состояние сменилось», а не тревога, которую потом снимают. Без этого
+# и running → unhealthy, и unhealthy → running приходили как «Отбой».
+STATE_CHANGE = frozenset({"StackStateChange", "ContainerStateChange"})
+HEALTHY_STATES = frozenset({"running", "healthy"})
+
+ONE_SHOT = INFORMATIONAL | FAILURE | STATE_CHANGE
 
 
 def _gb(value: Any) -> str:  # noqa: ANN401
@@ -121,6 +122,9 @@ def format_alert(payload: dict) -> str:
         icon = "ℹ️"
     elif resolved:
         icon = "✅"
+    elif kind in STATE_CHANGE:
+        to = str((inner or {}).get("to", "")).lower() if isinstance(inner, dict) else ""
+        icon = "✅" if to in HEALTHY_STATES else LEVEL_ICON.get(level, "🟠")
     else:
         icon = LEVEL_ICON.get(level, "🔔")