Add docs for upstream Grafana dashboards and storage requirements

docs/README.md

@@ -0,0 +1,26 @@
+# Nix Store, storage space and filesystem considerations
+
+The tracker requires significant storage space to run properly. In particular,
+there are two different areas you'll need storage for, the database and the Nix
+store.
+
+## Database
+
+In order to store three diffent Nixpkgs releases, you'll need around 80GB of
+space for the Postgresql database. This is the case right now for storing
+24.05, 24.11 and 25.05.
+
+As the number of CVEs and packages increases, the storage space requirement
+will most likely increase as well.
+
+## Nix Store and filesystem
+
+Since the tracker builds derivations for all packages, it creates a lot of
+small files in the filesystem. You need to make sure you have both enough space
+for this and enough inodes on your filesystem. We suggest you [optimise the nix
+store](https://wiki.nixos.org/wiki/Storage_optimization) and turn on automatic
+optimisation.
+
+If you're using ext4, read this [Nix issue](https://github.com/NixOS/nix/issues/1522)
+as you'll need to enable support for `large_dir`in your filesystem for
+optimisation to work.

infra/README.md

@@ -37,6 +37,6 @@ Then commit `secrets/name_of_secret.age` as usual.
 
 ## Metrics
 
-A [Prometheus Node Exporter](https://github.com/prometheus/node_exporter) is running exposing host specfic metrics. These are scraped by the nixos.org [Prometheus](https://prometheus.nixos.org/graph) and are also available under [Grafana](https://grafana.nixos.org/).
+A [Prometheus Node Exporter](https://github.com/prometheus/node_exporter) is running exposing host specfic metrics. These are scraped by the nixos.org [Prometheus](https://prometheus.nixos.org/graph) and are also available under [Grafana](https://grafana.nixos.org/d/rYdddlPWk/node-exporter-full?orgId=1&from=now-24h&to=now&timezone=browser&var-datasource=default&var-job=node&var-node=tracker.security.nixos.org:9100&var-diskdevices=%5Ba-z%5D%2B%7Cnvme%5B0-9%5D%2Bn%5B0-9%5D%2B%7Cmmcblk%5B0-9%5D%2B&refresh=1m).
 
-Moreover, a [Postgres Exporter](https://github.com/prometheus-community/postgres_exporter) and a [SQL exporter](https://github.com/justwatchcom/sql_exporter) run in the host exposing Postgres and application specific metrics.
+Moreover, a [Postgres Exporter](https://github.com/prometheus-community/postgres_exporter) and a [SQL exporter](https://github.com/justwatchcom/sql_exporter) run in the host exposing Postgres and application specific metrics. A dashboard for these metrics is [here](https://grafana.nixos.org/d/beo2uotj65lvkb/nix-security-tracker?orgId=1&from=now-6h&to=now&timezone=browser&var-Instance=tracker.security.nixos.org:9237).