This script increases the default limits configured by Rancher Desktop to accommodate tools like Prometheus.

rancher-desktop-limits.sh

cat > "$HOME/Library/Application Support/rancher-desktop/lima/_config/override.yaml" << 'EOT'
provision:
  - mode: system
    script: |
      #!/bin/sh
      # Increase per-user file descriptor limits
      cat << 'EOF' > /etc/security/limits.d/rancher-desktop.conf
      * soft     nofile         82920
      * hard     nofile         82920
      EOF

      # Increase inotify watch and instance counts for Prometheus
      sysctl -w fs.inotify.max_user_watches=524288
      sysctl -w fs.inotify.max_user_instances=512
EOT