Fix DD_FLUSH_TO_LOG env var type checking

Author: leandrodamascena

aws_lambda_powertools/metrics/provider/datadog/datadog.py

@@ -14,7 +14,7 @@
 from aws_lambda_powertools.metrics.provider import BaseProvider
 from aws_lambda_powertools.metrics.provider.datadog.warnings import DatadogDataValidationWarning
 from aws_lambda_powertools.shared import constants
-from aws_lambda_powertools.shared.functions import resolve_env_var_choice
+from aws_lambda_powertools.shared.functions import resolve_env_var_choice, strtobool
 
 if TYPE_CHECKING:
     from aws_lambda_powertools.shared.types import AnyCallableT
@@ -66,6 +66,8 @@ def __init__(
         )
         self.default_tags = default_tags or {}
         self.flush_to_log = resolve_env_var_choice(choice=flush_to_log, env=os.getenv(constants.DATADOG_FLUSH_TO_LOG))
+        if isinstance(self.flush_to_log, str):
+            self.flush_to_log = strtobool(self.flush_to_log)
 
     #  adding name,value,timestamp,tags
     def add_metric(