conntrackfixer: removal of the service

This is not needed anymore since Docker Engine v23. This version is
unmaintained since May 2025 (not that old).

See:
- https://github.com/moby/moby/pull/44752
- https://github.com/moby/moby/pull/44742

Fix #2153 (in a way)

console/data/docs/01-install.md

@@ -19,7 +19,7 @@ Check the `docker/docker-compose.yml` file for an example of how to deploy
 the [quick start procedure](00-intro.md#quick-start). This documentation assumes
 you are using the `docker compose` setup.
 
-The minimum supported version for Docker Engine is v25 (Docker API 1.44).
+The minimum supported version for Docker Engine is v23.
 
 If you want to compile the Docker image yourself, use `make docker`.
 

console/data/docs/05-troubleshooting.md

@@ -45,7 +45,6 @@ Check that all components are running and healthy:
 ```console
 $ docker compose ps --format "table {{.Service}}\t{{.Status}}"
 SERVICE                    STATUS
-akvorado-conntrack-fixer   Up 28 minutes
 akvorado-console           Up 27 minutes (healthy)
 akvorado-inlet             Up 27 minutes (healthy)
 akvorado-orchestrator      Up 27 minutes (healthy)
@@ -118,6 +117,19 @@ address of the exporter and the port with the correct port (2055 for NetFlow,
 0 packets dropped by kernel
 ```
 
+If you receive flows but they do not reach Akvorado, check you are running
+Docker Engine v23 or more recent:
+
+```console
+$ docker version
+[...]
+Server:
+ Engine:
+  Version:          27.5.1+dfsg4
+  API version:      1.47 (minimum version 1.24)
+[...]
+```
+
 Next, check if flows are sent to Kafka correctly:
 
 ```console

console/data/docs/99-changelog.md

@@ -10,12 +10,15 @@ identified with a specific icon:
 - 🩹: bug fix
 - 🌱: miscellaneous change
 
+## Unreleased
+
+- 💥 *docker*: remove conntrack-fixer service (this requires Docker Engine v23 or more recent)
+
 ## 2.0.4 - 2025-12-04
 
 The previous release introduced a performance regression for users with many
 flows from a single exporter. This is fixed in this release.
 
-- 💥 *docker*: bump minimum Docker API version supported to 1.44 (Docker Engine v25)
 - 🩹 *docker*: restart geoip container on boot
 - 🌱 *inlet*: make load-balancing algorithm for Kafka partitions configurable
   (`random` or `by-exporter`) and revert back to `random` by default (like before 2.0.3)