docs: deprecated: add entry for "fluent-async-connect" log-opt
This option was deperecated in the upstream fluentd logging driver v1.4.0,
and while we documented it as deprecated in the API changelog, there was
no mention yet in the deprecated docs.
relates to:
@@ -63,6 +63,7 @@ The table below provides an overview of the current status of deprecated feature
| Deprecated | [CLI plugins support](#cli-plugins-support) | v20.10 | - |
| Deprecated | [Dockerfile legacy `ENV name value` syntax](#dockerfile-legacy-env-name-value-syntax) | v20.10 | - |
| Removed | [`docker build --stream` flag (experimental)](#docker-build---stream-flag-experimental) | v20.10 | v20.10 |
+| Deprecated | [`fluentd-async-connect` log opt](#fluentd-async-connect-log-opt) | v20.10 | - |
| Removed | [Configuration options for experimental CLI features](#configuration-options-for-experimental-cli-features) | v19.03 | v22.04 |
| Deprecated | [Pushing and pulling with image manifest v2 schema 1](#pushing-and-pulling-with-image-manifest-v2-schema-1) | v19.03 | v20.10 |
| Removed | [`docker engine` subcommands](#docker-engine-subcommands) | v19.03 | v20.10 |
@@ -391,6 +392,21 @@ Users that want to use this feature are encouraged to enable BuildKit by setting
the `DOCKER_BUILDKIT=1` environment variable or through the daemon or CLI configuration
files.
+### `fluentd-async-connect` log opt
+
+**Deprecated in Release: v20.10**
+
+The `--log-opt fluentd-async-connect` option for the fluentd logging driver is
+[deprecated in favor of `--log-opt fluentd-async`](https://github.com/moby/moby/pull/39086).
+A deprecation message is logged in the daemon logs if the old option is used:
+
+```console
+fluent#New: AsyncConnect is now deprecated, please use Async instead
+```
+
+Users are encouraged to use the `fluentd-async` option going forward, as support
+for the old option will be removed in a future release.
+
### Pushing and pulling with image manifest v2 schema 1
**Deprecated in Release: v19.03**
