The bind onto /var/lib/private/victoriametrics needs its source to exist or
the mount fails -- and because it is `nofail`, quietly: RequiresMountsFor is
satisfied by /mnt/data itself, so the service would start anyway and write
the TSDB to the eMMC, which is the one thing the bind exists to prevent.
prowlarr.nix has no tmpfiles rule only because its directory predates the
module (migrated from ZimaOS); this is a fresh service, so it creates its
own, same as seerr.nix. Verified on jupiter: the mount is live on md127 and
nothing lands on the OS disk.
scrape_timeout was left implicit at the Prometheus default of 10s, which is
longer than the 5s interval -- VictoriaMetrics clamps it down rather than
erroring, so the config claimed 10s while the scraper used 5s. Say what
actually happens. Checked with `victoria-metrics -promscrape.config.dryRun`,
not just nix eval, which never builds the checked-config derivation.
Also comments: why the bind exists and why `nofail` is load-bearing (the
fileSystems block had none, unlike prowlarr.nix and seerr.nix), and why
mercury needs its own job -- scrape_interval is per-job and job_name must be
unique, so its `job` label will always differ from the other hosts'. Select
on `host` in dashboards or mercury drops out of them silently.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01S94o42aQ8VkBmEWvDem5xa
darmanandClaude Opus 5
luna