OpenTelemetry MCP Server

Instructions

Implementation Reference

• src/tools/loki_tools.py:175-217 (handler)

  The handler function 'list_log_label_values' that executes the request to Loki to fetch label values.

  async def list_log_label_values(
      client: LokiClient,
      label: str,
      start: Optional[str] = None,
      end: Optional[str] = None
  ) -> Dict[str, Any]:
      """
      Get all values for a specific log label.
      
      Args:
          client: Loki client
          label: Label name (e.g., 'namespace', 'job')
          start: Start time for value discovery
          end: End time for value discovery
          
      Returns:
          List of label values
      """
      try:
          # Parse time range if provided
          start_ns = None
          end_ns = None
          if start or end:
              start_dt, end_dt = parse_time_range(start, end)
              start_ns = to_loki_time(start_dt)
              end_ns = to_loki_time(end_dt)
          
          result = await client.label_values(label, start_ns, end_ns)
          
          if result.get("status") == "success":
              values = result.get("data", [])
              return {
                  "success": True,
                  "label": label,
                  "count": len(values),
                  "values": values
              }
          else:
              return {
                  "success": False,
                  "error": "Failed to fetch label values"
              }
      except Exception as e: