Make meta optional

core/lib/rules.py

@@ -138,9 +138,10 @@ def rule_notify(rule, index, message, meta=None):
         "rule": rule,
         "index": index,
         "message": message,
-        "matched": meta["aggs"],
         "notification_settings": notification_settings,
     }
+    if meta:
+        cast["matched"] = meta["aggs"]
 
     if rule.service == "ntfy":
         cast["msg"] = format_ntfy(**cast)
@@ -308,9 +309,7 @@ class NotificationRuleData(object):
             if len(aggs_for_index) == len(self.aggs.keys()):
                 if all(aggs_for_index):
                     # All aggs have matched
-                    self.rule_matched(
-                        index, results[: self.object.amount], meta
-                    )
+                    self.rule_matched(index, results[: self.object.amount], meta)
                     continue
             # Default branch, since the happy path has a continue keyword
             self.rule_no_match(index)