# infra/config/node-exporter-default — pushed to
# /etc/default/prometheus-node-exporter, read by Debian's
# prometheus-node-exporter.service as $ARGS.
#
# docs/design/infra.md section 5 item 1: "prometheus-node-exporter in each fly
# CT with --collector.textfile.directory=/var/lib/node_exporter/textfile,
# listening on the CT address :9100". 02-base.sh installs the package, but
# nothing set the flag, so the textfile collector was off and the watchdog's
# fly_watchdog_*, the retention pruner's and fly-backup-stage's .prom files
# would never have been scraped even once the directory existed. Found on the
# P0 spike run 2.
#
# The listen address is left at the package default (:9100 on all
# interfaces) deliberately: the container has no public route, and the metrics container's
# Prometheus has to reach it across the LAN.
ARGS="--collector.textfile.directory=/var/lib/node_exporter/textfile"