OpenTelemetry MCP Server

Instructions

Implementation Reference

• src/tools/prometheus_tools.py:100-140 (handler)

  The implementation of the `list_metrics` tool handler.

  async def list_metrics(
      client: PrometheusClient,
      prefix: Optional[str] = None
  ) -> Dict[str, Any]:
      """
      List all available metrics in Prometheus.
      
      Args:
          client: Prometheus client
          prefix: Optional prefix to filter metrics
          
      Returns:
          List of metric names
      """
      try:
          # Query __name__ label to get all metrics
          result = await client.label_values("__name__")
          
          if result.get("status") == "success":
              metrics = result.get("data", [])
              
              # Filter by prefix if provided
              if prefix:
                  metrics = [m for m in metrics if m.startswith(prefix)]
              
              return {
                  "success": True,
                  "count": len(metrics),
                  "metrics": metrics[:1000]  # Limit to prevent huge responses
              }
          else:
              return {
                  "success": False,
                  "error": "Failed to fetch metrics"
              }
      except Exception as e:
          logger.error(f"Error listing metrics: {e}")
          return {
              "success": False,
              "error": str(e)
          }