Changes in Telemetry Service

**Frontend:**
- Deleted irrelevant lines.

**Backend:**
- Added `delete_db_row_by_id` in the Stop Collector method.

src/telemetry/backend/service/TelemetryBackendService.py

@@ -32,8 +32,6 @@ from common.tools.service.GenericGrpcService import GenericGrpcService
 
 LOGGER             = logging.getLogger(__name__)
 METRICS_POOL       = MetricsPool('TelemetryBackend', 'backendService')
-# EXPORTER_ENDPOINT  = "http://10.152.183.2:9100/metrics"
-
 
 class TelemetryBackendService(GenericGrpcService):
     """

src/telemetry/frontend/service/TelemetryFrontendServiceServicerImpl.py

@@ -89,7 +89,14 @@ class TelemetryFrontendServiceServicerImpl(TelemetryFrontendServiceServicer):
                       request : CollectorId, grpc_context: grpc.ServicerContext # type: ignore
                      ) -> Empty:  # type: ignore
         LOGGER.info ("gRPC message: {:}".format(request))
-        self.PublishStopRequestOnKafka(request)
+        try:
+            collector_to_delete = request.collector_id.uuid
+            self.tele_db_obj.delete_db_row_by_id(
+                CollectorModel, "collector_id", collector_to_delete
+            )
+            self.PublishStopRequestOnKafka(request)
+        except Exception as e:
+            LOGGER.error('Unable to delete collector. Error: {:}'.format(e))
         return Empty()
 
     def PublishStopRequestOnKafka(self, collector_id):