Valkey Exporter 1.97.0-1

redis_exporter gives Prometheus the Valkey app's metrics - memory, clients, commands, keys and expiries - with a Grafana dashboard. It's for the Prometheus and Grafana apps: once they're installed (in any order), Prometheus collects its metrics every 30 seconds, and its dashboard (Valkey (Redis)) is in Grafana's NAS folder. It runs natively on the NAS (no Docker).

• It needs the Valkey app (installed first). It uses Valkey's password (Valkey has one, in Nas_Prog/_valkey/valkey.conf), read again every time it starts - restart it after changing that password.
• It listens on the NAS itself only (127.0.0.1:9121) and runs as its own user (redis_exporter, ID 91). Its files are kept in Nas_Prog/_redis_exporter, across reinstalls and removal.
• Its page shows whether it reaches Valkey, whether Prometheus collects its metrics, and links to its dashboard. Read Valkey's password again picks up a changed one.
• Its scrape job is prometheus/redis.yml and its dashboard dashboards/valkey.json: the Prometheus and Grafana apps pick up every app's (see their READMEs), and drop them when the app is removed.
• The dashboard is redis_exporter's own dashboard (contrib/grafana_prometheus_redis_dashboard.json, MIT, Copyright (c) 2016 Oliver), unchanged apart from its title, a nas tag and its namespace filter (a Kubernetes label, which the NAS hasn't).
• It's the official static program, checked against the SHA256 its release publishes (pinned in static/redis_exporter/build.sh). Intel models only.