Document CetusGuard as a Docker socket proxy solution (#14806)

* Document CetusGuard as a Docker socket proxy solution

* Re-add Docker Socket Proxy to docs

collectors/cgroups.plugin/README.md

@@ -120,8 +120,9 @@ container names. To do this, ensure `podman system service` is running and Netda
 to `/run/podman/podman.sock` (the default permissions as specified by upstream are `0600`, with owner `root`, so you
 will have to adjust the configuration).
 
-[docker-socket-proxy](https://github.com/Tecnativa/docker-socket-proxy) can also be used to give Netdata restricted
+[Docker Socket Proxy (HAProxy)](https://github.com/Tecnativa/docker-socket-proxy) or [CetusGuard](https://github.com/hectorm/cetusguard)
-access to the socket. Note that `PODMAN_HOST` in Netdata's environment should be set to the proxy's URL in this case.
+can also be used to give Netdata restricted access to the socket. Note that `PODMAN_HOST` in Netdata's environment should
+be set to the proxy's URL in this case.
 
 ### Charts with zero metrics
 

packaging/docker/README.md

@@ -331,17 +331,17 @@ your machine from within the container. Please read the following carefully.
 #### Docker socket proxy (safest option)
 
 Deploy a Docker socket proxy that accepts and filters out requests using something like
-[HAProxy](https://github.com/netdata/netdata/blob/master/docs/Running-behind-haproxy.md) so that it restricts connections to read-only access to the CONTAINERS
+[HAProxy](https://github.com/netdata/netdata/blob/master/docs/Running-behind-haproxy.md) or
+[CetusGuard](https://github.com/hectorm/cetusguard) so that it restricts connections to read-only access to the `/containers`
 endpoint.
 
 The reason it's safer to expose the socket to the proxy is because Netdata has a TCP port exposed outside the Docker
 network. Access to the proxy container is limited to only within the network.
 
-Below is [an example repository (and image)](https://github.com/Tecnativa/docker-socket-proxy) that provides a proxy to
+Here are two examples, the first using [a Docker image based on HAProxy](https://github.com/Tecnativa/docker-socket-proxy)
-the socket.
+and the second using [CetusGuard](https://github.com/hectorm/cetusguard).
 
-You run the Docker Socket Proxy in its own Docker Compose file and leave it on a private network that you can add to
+##### Docker Socket Proxy (HAProxy)
-other services that require access.
 
 ```yaml
 version: '3'
@@ -356,13 +356,40 @@ services:
   proxy:
     image: tecnativa/docker-socket-proxy
     volumes:
-     - /var/run/docker.sock:/var/run/docker.sock:ro
+      - /var/run/docker.sock:/var/run/docker.sock:ro
     environment:
       - CONTAINERS=1
-
 ```
 **Note:** Replace `2375` with the port of your proxy.
 
+##### CetusGuard
+
+```yaml
+version: '3'
+services:
+  netdata:
+    image: netdata/netdata
+    # ... rest of your config ...
+    ports:
+      - 19999:19999
+    environment:
+      - DOCKER_HOST=cetusguard:2375
+  cetusguard:
+    image: hectorm/cetusguard:v1
+    read_only: true
+    volumes:
+      - /var/run/docker.sock:/var/run/docker.sock:ro
+    environment:
+      CETUSGUARD_BACKEND_ADDR: unix:///var/run/docker.sock
+      CETUSGUARD_FRONTEND_ADDR: tcp://:2375
+      CETUSGUARD_RULES: |
+        ! Inspect a container
+        GET %API_PREFIX_CONTAINERS%/%CONTAINER_ID_OR_NAME%/json
+```
+
+You can run the socket proxy in its own Docker Compose file and leave it on a private network that you can add to
+other services that require access.
+
 #### Giving group access to the Docker socket (less safe)
 
 > :warning: Caution