docs: document -d flag and Docker process supervision model

- Add -d true|false option to PD and Store startup options sections
  (default: true = daemon; false = foreground for Docker/supervisors)
- Add section to docker/README.md explaining HEALTHCHECK endpoints
  and the Java process supervision model (replaces old cron monitor)

Chunk 10 of #3043.

Author: bitflicker64

hugegraph-pd/README.md

@@ -78,12 +78,13 @@ bin/stop-hugegraph-pd.sh
 #### Startup Options
 
 ```bash
-bin/start-hugegraph-pd.sh [-g GC_TYPE] [-j "JVM_OPTIONS"] [-y ENABLE_OTEL]
+bin/start-hugegraph-pd.sh [-g GC_TYPE] [-j "JVM_OPTIONS"] [-y ENABLE_OTEL] [-d DAEMON]
 ```
 
 - `-g`: GC type (`g1` or `ZGC`, default: `g1`)
 - `-j`: Custom JVM options (e.g., `-j "-Xmx4g -Xms4g"`)
 - `-y`: Enable OpenTelemetry tracing (`true` or `false`, default: `false`)
+- `-d`: Daemon mode (`true` = daemon, `false` = foreground; default: `true`). Set to `false` when running under Docker or a process supervisor so the container exits if Java dies.
 
 ### Configuration
 

hugegraph-server/hugegraph-dist/docker/README.md

@@ -130,3 +130,20 @@ HUGEGRAPH_VERSION=1.7.0 docker compose -f docker-compose-3pd-3store-3server.yml
 
 See [docker/README.md](../../../docker/README.md) for the full setup guide,
 environment variable reference, and troubleshooting.
+
+## 6. Process Supervision & Health Checks
+
+All four HugeGraph Docker images (PD, Store, Server, Server-hstore) include
+native `HEALTHCHECK` instructions. `docker ps` shows real health status:
+
+| Image | Health endpoint |
+|---|---|
+| `hugegraph/hugegraph` | `GET /versions` on port 8080 |
+| `hugegraph/hugegraph-hstore` | `GET /versions` on port 8080 |
+| `hugegraph/hugegraph-pd` | `GET /v1/health` on port 8620 |
+| `hugegraph/hugegraph-store` | `GET /v1/health` on port 8520 |
+
+The entrypoints supervise the Java process directly — when Java exits, the
+container exits and Docker's `restart: unless-stopped` policy brings it back
+automatically. The old cron-based monitor (`-m true`) is for VM/bare-metal
+deployments only and is not used in Docker images.

hugegraph-store/README.md

@@ -231,11 +231,12 @@ bin/restart-hugegraph-store.sh
 #### Startup Options
 
 ```bash
-bin/start-hugegraph-store.sh [-g GC_TYPE] [-j "JVM_OPTIONS"]
+bin/start-hugegraph-store.sh [-g GC_TYPE] [-j "JVM_OPTIONS"] [-d DAEMON]
 ```
 
 - `-g`: GC type (`g1` or `ZGC`, default: `g1`)
 - `-j`: Custom JVM options (e.g., `-j "-Xmx16g -Xms8g"`)
+- `-d`: Daemon mode (`true` = daemon, `false` = foreground; default: `true`). Set to `false` when running under Docker or a process supervisor so the container exits if Java dies.
 
 Default JVM memory settings (defined in `start-hugegraph-store.sh`):
 - Max heap: 32GB