Reload bearer token from disk to work with kubernetes bound-service-a…

…ccount-tokens

datadog_checks_base/datadog_checks/base/checks/openmetrics/mixins.py

@@ -364,9 +364,6 @@ def _get_setting(name, default):
         # 'bearer_token_auth' should be enabled.
         config['bearer_token_path'] = instance.get('bearer_token_path', default_instance.get('bearer_token_path', None))
 
-        # The service account bearer token to be used for authentication
-        config['_bearer_token'] = self._get_bearer_token(config['bearer_token_auth'], config['bearer_token_path'])
-
         config['telemetry'] = is_affirmative(instance.get('telemetry', default_instance.get('telemetry', False)))
 
         # The metric name services use to indicate build information
@@ -415,7 +412,9 @@ def get_http_handler(self, scraper_config):
 
         headers = http_handler.options['headers']
 
-        bearer_token = scraper_config['_bearer_token']
+        # The service account bearer token to be used for authentication
+        # this needs to be reloaded from it's path in case the token was refreshed
+        bearer_token = self._get_bearer_token(scraper_config['bearer_token_auth'], scraper_config['bearer_token_path'])
         if bearer_token is not None:
             headers['Authorization'] = 'Bearer {}'.format(bearer_token)