def __init__(self, enabled=False, include_apis=None,<EOL>retention_policy=None):
_validate_not_none("<STR_LIT>", enabled)<EOL>if enabled:<EOL><INDENT>_validate_not_none("<STR_LIT>", include_apis)<EOL><DEDENT>self.version = u'<STR_LIT:1.0>'<EOL>self.enabled = enabled<EOL>self.include_apis = include_apis<EOL>self.retention_policy = retention_policy if retention_policy else RetentionPolicy()<EOL>
:param bool enabled: 
    Indicates whether metrics are enabled for 
    the service.
:param bool include_apis: 
    Required if enabled is True. Indicates whether metrics 
    should generate summary statistics for called API operations.
:param RetentionPolicy retention_policy: 
    The retention policy for the metrics.