google.adk.evaluation.metric_evaluator_registry.DEFAULT_METRIC_EVALUATOR_REGISTRY
https://github.com/google/adk-python/blob/v1.21.0/src/google/adk/evaluation/metric_evaluator_registry.py#L133
https://github.com/google/adk-python/blob/v1.21.0/src/google/adk/evaluation/trajectory_evaluator.py
https://github.com/google/adk-python/blob/v1.21.0/src/google/adk/evaluation/response_evaluator.py
https://github.com/google/adk-python/blob/v1.21.0/src/google/adk/evaluation/hallucinations_v1.py
https://github.com/google/adk-python/blob/v1.21.0/src/google/adk/evaluation/final_response_match_v2.py
rubric_based_tool_use_quality_v1
https://github.com/google/adk-python/blob/v1.21.0/src/google/adk/evaluation/rubric_based_tool_use_quality_v1.py
https://github.com/google/adk-python/blob/v1.21.0/src/google/adk/evaluation/safety_evaluator.py