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Grafana 12 expects Prometheus annotation queries wrapped in a 'target'
object with datasource, expr, refId, and range fields. The previous
format had expr/step as top-level fields which Grafana silently ignored.
The custom disk-usage-collector shell script + minutely timer is replaced
by prometheus-zfs-exporter (pdf/zfs_exporter, packaged in nixpkgs as
services.prometheus.exporters.zfs). The exporter provides pool capacity
metrics (allocated/free/size) natively.
Partition metrics (/boot, /persistent, /nix) now use node_exporter's
built-in filesystem collector (node_filesystem_*_bytes) which already
runs and collects these metrics.
Also fixes a latent race condition in serviceMountWithZpool: the -mounts
service now orders after zfs-mount.service (which runs 'zfs mount -a'),
not just after pool import. Without this, the mount check could run
before datasets are actually mounted.
llama.cpp server has a built-in /metrics endpoint exposing
prompt_tokens_seconds, predicted_tokens_seconds, tokens_predicted_total,
n_decode_total, and n_busy_slots_per_decode. Enable it with --metrics
and add a Prometheus scrape target, replacing the need for any external
metric collection for LLM inference monitoring.
