Fix Grafana dashboards mount; keep connector OTLP (AWG_CONF must omit DNS=)

- deploy/docker-compose.yml: mount the provisioned dashboards at
  /etc/grafana/dashboards, not /var/lib/grafana/dashboards — the grafana-data
  volume mounts over the latter and shadows the nested bind, so the provider
  logged "readdirent /var/lib/grafana/dashboards: no such file or directory".
  dashboards.yaml provider path updated to match.
- Connector telemetry stays OTLP. The VPN sidecar's netns reaches the collector's
  internal IP fine (connected route, off-tunnel), but the sidecar's DNS hijacks
  name resolution: AWG_CONF must NOT carry a DNS= directive, else otelcol won't
  resolve ("produced zero addresses"). Without DNS= the netns uses Docker's
  resolver (resolves both otelcol and api.telegram.org). Documented in
  deploy/README.md (AWG_CONF row + wiring note), ARCHITECTURE §13, compose comment.

deploy/README.md

@@ -49,7 +49,7 @@ feeds the compose's `POSTGRES_PASSWORD`, etc.
 | Variable | Gitea kind | Purpose |
 | --- | --- | --- |
 | `POSTGRES_PASSWORD` | secret | Postgres password (also embedded in `BACKEND_POSTGRES_DSN`). |
-| `AWG_CONF` | secret | AmneziaWG config for the VPN sidecar (the connector's only egress). |
+| `AWG_CONF` | secret | AmneziaWG config for the VPN sidecar (the connector's only egress). **Must not contain a `DNS=` line** — it hijacks the shared netns's resolv.conf and breaks the connector resolving `otelcol` (telemetry export). Without it, Docker's resolver handles both `otelcol` and `api.telegram.org`. |
 | `GM_BASICAUTH_HASH` | secret | bcrypt hash gating `/_gm` (admin console + Grafana). Generate with `docker run --rm caddy:2-alpine caddy hash-password --plaintext '<pw>'`. |
 | `TELEGRAM_MINIAPP_URL` | variable | The Mini App URL the connector hands out in deep links / buttons. |
 
@@ -87,10 +87,14 @@ These are hard-wired in `docker-compose.yml` (no `${...}`), pointing the service
 at each other on the `internal` network — listed here so they are not mistaken for
 missing config: `BACKEND_POSTGRES_DSN` (→ `postgres`, `search_path=backend`),
 `GATEWAY_BACKEND_HTTP_URL`/`_GRPC_ADDR` (→ `backend`),
-`GATEWAY_CONNECTOR_ADDR`/`BACKEND_CONNECTOR_ADDR` (→ `telegram:9091`), the three
-services' `*_OTEL_*_EXPORTER=otlp` + `OTEL_EXPORTER_OTLP_ENDPOINT=http://otelcol:4317`
-(`_INSECURE=true`). `GATEWAY_ADMIN_*` is intentionally **unset** — caddy owns `/_gm`
-in the contour.
+`GATEWAY_CONNECTOR_ADDR`/`BACKEND_CONNECTOR_ADDR` (→ `telegram:9091`), and all three
+services' `*_OTEL_*_EXPORTER=otlp` → `OTEL_EXPORTER_OTLP_ENDPOINT=http://otelcol:4317`
+(`_INSECURE=true`). The connector shares the VPN sidecar's netns: routing to the
+collector's internal IP is fine (connected route), but its `AWG_CONF` must **not**
+set a `DNS=` directive — that hijacks resolv.conf and breaks resolving `otelcol`
+("produced zero addresses"); without it the netns uses Docker's resolver, which
+resolves both `otelcol` and `api.telegram.org`. `GATEWAY_ADMIN_*` is intentionally
+**unset** — caddy owns `/_gm` in the contour.
 
 ## Host-side setup (outside this repo)
 

deploy/docker-compose.yml

@@ -125,6 +125,12 @@ services:
       TELEGRAM_API_BASE_URL: ${TELEGRAM_API_BASE_URL:-}
       TELEGRAM_LOG_LEVEL: ${LOG_LEVEL:-info}
       TELEGRAM_SERVICE_NAME: scrabble-telegram
+      # The connector shares the VPN sidecar's netns. Routing to the collector's
+      # internal IP stays off the tunnel (connected route), but the sidecar's DNS
+      # hijacks name resolution: AWG_CONF must NOT carry a `DNS=` directive, else
+      # `otelcol` won't resolve ("produced zero addresses"). Without DNS= the netns
+      # uses Docker's resolver, which resolves both otelcol and api.telegram.org
+      # (see deploy/README.md).
       TELEGRAM_OTEL_TRACES_EXPORTER: otlp
       TELEGRAM_OTEL_METRICS_EXPORTER: otlp
       OTEL_EXPORTER_OTLP_ENDPOINT: http://otelcol:4317
@@ -199,7 +205,10 @@ services:
       GF_SECURITY_ADMIN_PASSWORD: ${GRAFANA_ADMIN_PASSWORD:-admin}
     volumes:
       - ./grafana/provisioning:/etc/grafana/provisioning:ro
-      - ./grafana/dashboards:/var/lib/grafana/dashboards:ro
+      # Dashboards live under /etc/grafana (NOT /var/lib/grafana, which the
+      # grafana-data volume mounts over — a nested bind there is shadowed and the
+      # provider logs "no such file or directory").
+      - ./grafana/dashboards:/etc/grafana/dashboards:ro
       - grafana-data:/var/lib/grafana
     networks: [internal]
 

deploy/grafana/provisioning/dashboards/dashboards.yaml

@@ -11,5 +11,5 @@ providers:
     editable: true
     allowUiUpdates: true
     options:
-      path: /var/lib/grafana/dashboards
+      path: /etc/grafana/dashboards
       foldersFromFilesStructure: false