[threadstats] do not modify metric-level tags

Do not modify metric-level `tags` parameters when `constant_tags` is set. Similar to #94.
DataDog · Mar 1, 2016 · e156ed6 · e156ed6
1 parent a60d519
commit e156ed6
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/datadog/threadstats/base.py b/datadog/threadstats/base.py
@@ -125,7 +125,7 @@ def event(self, title, text, alert_type=None, aggregation_key=None,
             # Append all client level tags to every event
             if self.constant_tags:
                 if tags:
-                    tags += self.constant_tags
+                    tags = tags + self.constant_tags
                 else:
                     tags = self.constant_tags