fix(alerts): tell informational alerts from real stand-downs by type

src/healthbot/alerts.py

@@ -5,6 +5,18 @@ from typing import Any
 
 LEVEL_ICON = {"OK": "✅", "WARNING": "🟠", "CRITICAL": "🔴"}
 
+INFORMATIONAL = frozenset(
+    {
+        "StackImageUpdateAvailable",
+        "DeploymentImageUpdateAvailable",
+        "StackAutoUpdated",
+        "DeploymentAutoUpdated",
+        "ScheduleRun",
+        "Test",
+        "Custom",
+    }
+)
+
 
 def _gb(value: Any) -> str:  # noqa: ANN401
     try:
@@ -87,12 +99,20 @@ def _describe(kind: str, d: dict) -> tuple[str, list[str]]:  # noqa: C901, PLR09
 
 def format_alert(payload: dict) -> str:
     level = str(payload.get("level", "")).upper()
-    resolved = bool(payload.get("resolved")) or level == "OK"
     data = payload.get("data") or {}
     kind = str(data.get("type") or "Unknown")
     inner = data.get("data") or {}
 
-    icon = "✅" if resolved else LEVEL_ICON.get(level, "🔔")
+    informational = kind in INFORMATIONAL
+    resolved = bool(payload.get("resolved")) and not informational
+
+    if informational:
+        icon = "ℹ️"
+    elif resolved:
+        icon = "✅"
+    else:
+        icon = LEVEL_ICON.get(level, "🔔")
+
     title, details = _describe(kind, inner if isinstance(inner, dict) else {})
 
     if resolved: