CE Node Exporter

A Prometheus exporter for Compiler Explorer infrastructure that provides system metrics about mount points.

Metrics

The exporter provides the following metrics:

• ce_node_mounts_total{type="..."} - Total number of mount points by filesystem type
  • type="all" - Total count of all mounts
  • type="cefs1" - Count of squashfs mounts at /efs/compiler-explorer/
  • type="cefs2" - Count of mounts at /cefs/XX/* (where XX is a 2-character hash prefix)
  • Other filesystem types (ext4, tmpfs, squashfs, etc.)

Building

./build.sh

Running

# Default port 9100
./ce-node-exporter

# Custom port
./ce-node-exporter --listen-address=:9200

Systemd Service

Install the service:

sudo cp ce-node-exporter.service /etc/systemd/system/
sudo systemctl daemon-reload
sudo systemctl enable ce-node-exporter
sudo systemctl start ce-node-exporter

Configuration

The service can be configured by editing /etc/systemd/system/ce-node-exporter.service and modifying the --listen-address parameter in the ExecStart line.

Endpoints

• /metrics - Prometheus metrics endpoint

Requirements

• Go 1.22 or later (builds with Go 1.24.2 from /opt/compiler-explorer/golang-1.24.2/)
• Linux system with /proc/mounts available