Add observability stack documentation

observability.md

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+# Homelab Observability Stack
+
+## Overview
+Full observability setup for wtfsolutions.cc homelab.
+
+## Services
+
+### InfluxDB (LXC 118)
+- **URL:** http://influxdb.wtfsolutions.cc
+- **Credentials:** admin / influxadmin1
+- **Org:** homelab | **Bucket:** metrics
+- **Token:** V2Kvcei0Pky6xw2h4gEN7HSKiwBeQkvIkw05_LUOsFKDZYZ-aIBCy_5D_njBqJJISVyEr4JosCq_WyMVRXivqw==
+- **Retention:** 90 days
+- **DBRP mapping:** telegraf → metrics bucket (InfluxQL compat)
+
+### Grafana (LXC 119)
+- **URL:** http://grafana.wtfsolutions.cc
+- **Credentials:** admin / pcideas
+- **Datasource:** InfluxDB (Flux, UID: cfi6urg8tk4cgd)
+  - Auth via custom HTTP header (Authorization: Token ...) — do NOT use token field in UI
+- **Dashboards:**
+  - Homelab Fleet Overview — RAM/CPU/Disk across all hosts
+  - Telegraf Metrics dashboard for InfluxDB 2.0 — per-host drill-down
+- **Alerts:** RAM >90%, Disk >90%, CPU >85% → ntfy.sh
+
+### Telegraf
+- **Installed on:** All 21 LXCs + proxmox04 host + homeassistant VM
+- **Interval:** 30s
+- **Inputs:** cpu, mem, disk, diskio, net, system, processes
+- **Processor:** converter (uptime uint→float for InfluxDB compat)
+- **Note:** LXC uptime reflects Proxmox host uptime (shared kernel) — only VMs show real uptime
+- **Config path:** /etc/telegraf/telegraf.conf on each host
+
+### Uptime Kuma (LXC 125)
+- **URL:** http://kuma.wtfsolutions.cc
+- **Credentials:** admin / kuma123
+- **Monitors:** 21 services across 4 groups
+- **Status page:** /status/homelab (slug: homelab)
+- **Notifications:** ntfy.sh topic wtfsolutions-6fa579e38a5f
+
+### Homepage (LXC 126)
+- **URL:** http://homepage.wtfsolutions.cc
+- **Config:** /opt/homepage/config/
+- **Service:** systemd homepage.service
+- **Widgets:** Sonarr, Radarr, Tautulli, Overseerr, qBittorrent, Pi-hole, Uptime Kuma, Immich, Plex
+- **Notes:**
+  - Immich widget requires version: 2 (Immich v1.100+)
+  - Pi-hole widget: no key needed (unauthenticated API)
+  - Plex token from Tautulli: oD_GxEfKD4PyZ6LJmopc
+
+## Alerts (ntfy.sh)
+- **Topic:** wtfsolutions-6fa579e38a5f
+- **Server:** https://ntfy.sh
+- **Sources:** Uptime Kuma (service down) + Grafana (resource thresholds)
+- **App:** Install ntfy on phone, subscribe to topic above
+
+## Removed Services
+- Homarr (LXC 112) — replaced by Homepage
+- OpenCloud (LXC 122) — decommissioned
+- Authentik (LXC 124) — decommissioned