Prometheus Custom Metrics: Fork and Clone Syscall Details Exporter Using a SystemTap Script

To use this exporter, you need to have go and systemtap installed on your system. This exporter relies on kernel debug symbols. If they aren't available, it won't work. The kernel module created by stap uses kernel probes for the fork and clone system calls. Every time these events occur, it prints details to standard output, which is then directed into a pipe and consumed by this Go exporter.

1. Compile the custom_metrics kernel module. This will create a module named custom_metrics.ko in the current directory:

   sudo stap -p4 -m custom_metrics custom_metrics.stp

2. Run the exporter:

   go run exporter.go

3. Verify the metrics endpoint on port 9100:

   curl http://localhost:9100/metrics

• This was tested on Ubuntu 20.04.06 LTS
  kernel: 5.4.0-204-generic
  kernel debug symbols: linux-image-5.4.0-204-generic-dbgsym
  SystemTap version:
  Systemtap translator/driver (version 4.2/0.176, Debian version 4.2-3ubuntu0.1 (focal)) Copyright (C) 2005-2019 Red Hat, Inc. and others This is free software; see the source for copying conditions. tested kernel versions: 2.6.32 ... 5.4-rc6 enabled features: AVAHI BPF LIBSQLITE3 NLS NSS