code: def expected_flow_metric_labels():
      return [
          "jina_number_of_pending_requests",
          "jina_received_request_bytes_bucket",
          "jina_received_request_bytes_count",
          "jina_received_request_bytes_sum",
          "jina_received_response_bytes_bucket",
          "jina_received_response_bytes_count",
          "jina_received_response_bytes_sum",
          "jina_receiving_request_seconds_bucket",
          "jina_receiving_request_seconds_count",
          "jina_receiving_request_seconds_sum",
          "jina_sent_request_bytes_bucket",
          "jina_sent_request_bytes_count",
          "jina_sent_request_bytes_sum",
          "jina_sent_response_bytes_bucket",
          "jina_sent_response_bytes_count",
          "jina_sent_response_bytes_sum",
          "jina_successful_requests",
          "jina_failed_requests",
          "jina_document_processed",
          "jina_receiving_request_seconds_bucket",
          "jina_receiving_request_seconds_count",
          "jina_receiving_request_seconds_sum",
          "jina_sending_request_seconds_bucket",
          "jina_sending_request_seconds_count",
          "jina_sending_request_seconds_sum",
          "jina_process_request_seconds_bucket",
          "jina_process_request_seconds_count",
          "jina_process_request_seconds_sum",
          "executor",
          "executor_endpoint",
          "runtime_name",
          "target_info",  # otel or prometheus related
          "request_counter",  # otel or prometheus related
          "up",  # otel or prometheus related
      ]
  
file_path: jina/tests/integration/instrumentation/conftest.py
imports: import os
  import time
  import pytest
  from prometheus_api_client import PrometheusConnect
  from jina.helper import random_port
label_desc: Use image node_id 8 for calling a global function with example usage: expected_flow_metric_labels() and returns: list