[Unit]
# Time series of PHP-FPM pool occupancy and worker memory.
# A looping service rather than a 15s systemd timer: one long-lived process
# instead of 5,760 spawns a day, and it can hold the tick counter that paces
# the expensive PSS walk.
Description=PHP-FPM pool metrics sampler
After=php8.3-fpm.service
Wants=php8.3-fpm.service

[Service]
Type=simple
ExecStart=/usr/local/bin/fpm-sample.sh
Restart=always
RestartSec=10

# Reads /proc/<pid>/smaps_rollup for www-data-owned workers, and talks to both
# pool sockets (mode 0660, owner www-data).
User=root

# Never let monitoring compete with the thing it is monitoring.
Nice=10
IOSchedulingClass=idle

# Environment=INTERVAL=15
# Environment=PSS_EVERY=20
# Environment=SATURATION_PCT=50

[Install]
WantedBy=multi-user.target