issue:4098913: [TFS Plugin]: Fixing streaming from telemetry with Pro…

…metheus format is broken (#267)

plugins/fluentd_telemetry_plugin/src/streamer.py

@@ -756,10 +756,6 @@ def _parse_telemetry_csv_metrics_to_json(self, data, msg_tag, is_xdr_mode):
             port_key_generator = self._get_port_id_from_csv_row
             port_key_generator_args = (normal_port_id_keys_indexes,)
 
-        if self.last_streamed_data_sample_per_endpoint.get(msg_tag, None) is None:
-            self.last_streamed_data_sample_per_endpoint[msg_tag] = {}
-
-
         parser_method = self._parse_telemetry_csv_metrics_to_json_with_delta if self.stream_only_new_samples \
             else self._parse_telemetry_csv_metrics_to_json_without_delta
 
@@ -872,6 +868,8 @@ def stream_data(self, telemetry_endpoint):  # pylint: disable=too-many-locals
             new_data_timestamp = None
             num_of_counters = data_len = 0
             if telemetry_data:
+                if self.last_streamed_data_sample_per_endpoint.get(msg_tag, None) is None:
+                    self.last_streamed_data_sample_per_endpoint[msg_tag] = {}
                 ufm_telemetry_is_prometheus_format = self._check_data_prometheus_format(telemetry_data)
                 logging.info('Start Processing The Received Response From %s', msg_tag)
                 start_time = time.time()