Merge remote-tracking branch 'origin/main' into fix-thought-signature-pruning

Author: its-amann

src/google/adk/telemetry/_metrics.py

@@ -99,6 +99,7 @@
     unit="1",
     description="Number of inference (model) calls per agent invocation.",
     explicit_bucket_boundaries_advisory=[
+        0,
         1,
         2,
         3,
@@ -118,6 +119,7 @@
     unit="1",
     description="Number of tool calls per agent invocation.",
     explicit_bucket_boundaries_advisory=[
+        0,
         1,
         2,
         3,