diff --git a/hosts/skydick/README.md b/hosts/skydick/README.md
index 4c96761..e90741a 100644
--- a/hosts/skydick/README.md
+++ b/hosts/skydick/README.md
@@ -1,6 +1,10 @@
 # Skydick
 
-`skydick` is the multi-user data-pool host at `10.0.1.1`.
+`skydick` is the multi-user data-pool and monitoring host at `10.0.1.1`.
+
+## Services
+
+### Data pool (SMB / NFS / iSCSI)
 
 The full user guide and admin runbook live in [`DATAPOOL.md`](./DATAPOOL.md).
 
@@ -12,3 +16,54 @@
 - share paths for SMB and NFS
 - per-user dataset layout
 - verification and troubleshooting
+
+### InfluxDB (fleet monitoring)
+
+InfluxDB v2 runs as a native NixOS service (`services.influxdb2`), declared in
+`modules/influxdb.nix`. It stores time-series data for the entire fleet.
+
+- **Data path**: `/var/lib/influxdb2` → bind-mounted from ZFS dataset `dick/system/influxdb`
+  (recordsize=128K, zstd compression, 500G quota)
+- **API**: `http://10.0.1.1:8086`
+- **Organization**: `door1`
+- **Buckets**: `door1` (door1 host + iDRAC + IoT sensors), `skydick` (skydick host metrics)
+- **Retention**: infinite (ZFS handles the storage)
+- **Auth**: operator token in agenix (`secrets/influxdb-token.age`), same token
+  used by Telegraf on both skydick and door1
+- **InfluxQL v1 compat**: enabled via DBRP mapping (`door1` database → `door1` bucket),
+  used by Grafana dashboards that predate the Flux migration
+
+#### Data sources writing here
+
+| Source | Bucket | Transport | What |
+|--------|--------|-----------|------|
+| skydick Telegraf (local) | `skydick` | localhost:8086 | CPU, mem, disk, ZFS, SMART, sensors, zpool health |
+| door1 Telegraf (Docker) | `door1` | 10.0.1.1:8086 | CPU, mem, disk, GPU, Docker, iDRAC SNMP, UPS, WireGuard, Fala IoT sensor |
+
+#### ZFS dataset
+
+```bash
+# Created once (already done):
+zfs create -o recordsize=128K -o mountpoint=/srv/system/influxdb \
+  -o quota=500G dick/system/influxdb
+chown influxdb:influxdb /srv/system/influxdb
+
+# Check:
+zfs list -o name,used,avail,compressratio dick/system/influxdb
+```
+
+#### Grafana connection
+
+Grafana runs on door1 (Docker) and queries skydick over 10GbE. Three datasources:
+
+| UID | Name | Type | Bucket | Used by |
+|-----|------|------|--------|---------|
+| `eei6px00mwsu8e` | influxdb-door1 | InfluxQL | door1 | Legacy dashboards (iDRAC, system, storage, UPS, GPU, Docker) |
+| `influxdb` | InfluxDB | Flux | door1 | Server room dashboard, newer alert rules |
+| `influxdb-skydick` | InfluxDB-Skydick | Flux | skydick | Skydick system dashboards |
+
+### Telegraf
+
+Declared in `modules/monitoring.nix`. Collects host metrics and writes to the
+local InfluxDB. The `influxUrl` option defaults to `http://10.0.1.1:8086` but
+skydick overrides it to `http://127.0.0.1:8086` for local writes.