Adds whatsnew

Author: Robert Fekete

content/docs/configuration/crds/extensions/hosttailer_types.md

@@ -159,7 +159,50 @@ Override systemd log path
 
 ### systemdFilter (string, optional) {#systemdtailer-systemdfilter}
 
-Filter to select systemd unit example: kubelet.service 
-
-
-
+Filter to select the systemd unit, for example: `kubelet.service`
+If the `systemdFilter` is not specified, `_SYSTEMD_UNIT` is used.
+
+For example, the following HostTailer creates a systemd tailer for the `kubelet.service` and for kernel logs, and logs the kernel logs under the `SYSLOG_IDENTIFIER` journal field.
+
+{{< highlight yaml >}}
+apiVersion: logging-extensions.banzaicloud.io/v1alpha1
+kind: HostTailer
+metadata:
+  labels:
+    app.kubernetes.io/name: systemd-hosttailer
+  name: systemd
+  namespace: logging
+spec:
+  systemdTailers:
+  - maxEntries: 100
+    name: kubelet
+    systemdFilter: kubelet.service
+  - maxEntries: 100
+    name: kernel
+    systemdFilter: SYSLOG_IDENTIFIER=kernel
+{{</ highlight >}}
+
+The generated container will have the following arguments:
+
+{{< highlight yaml >}}
+      - command:
+        - /fluent-bit/bin/fluent-bit
+        - -i
+        - systemd
+        - -p
+        - path=/var/log/journal
+        - -p
+        - db=/var/pos/systemd-host-tailer-kernel.db
+        - -p
+        - max_entries=100
+        - -p
+        - systemd_filter=SYSLOG_IDENTIFIER=kernel
+        - -o
+        - file
+        - -p
+        - format=plain
+        - -p
+        - path=/dev/
+        - -p
+        - file=stdout
+{{</ highlight >}}

content/docs/whats-new/_index.md

@@ -3,6 +3,35 @@ title: What's new
 weight: 50
 ---
 
+## Version 4.10
+
+The following are the highlights and main changes of Logging operator 4.10. For a complete list of changes and bugfixes, see the [Logging operator 4.10 releases page](https://github.com/kube-logging/logging-operator/releases/tag/4.10.0)<!-- and the [Logging operator 4.9 release blog post](https://axoflow.com/logging-operator-4.9-release)-->.
+
+- You can now control the memory usage of Fluent Bit in persistent buffering mode using the [`storage.max_chunks_up`]({{< relref "/docs/configuration/crds/v1beta1/fluentbit_types.md#bufferstorage-storage.max_chunks_up" >}}) option.
+
+- When using [`systemdFilters`]({{< relref "/docs/configuration/crds/extensions/hosttailer_types.md#systemdtailer-systemdfilter" >}}) in `HostTailers`, you can now specify the journal field to use.
+
+- The documentation of the [Gelf Fluentd output]({{< relref "/docs/configuration/plugins/outputs/gelf.md" >}}) has been improved, and now includes the `max_bytes` option that can limit the size of the messages.
+
+- You can now configure image repository overrides in the syslog-ng spec (both in the `Logging` resource and in the `SyslogNGConfig` resource):
+
+    ```yaml
+    syslogNGImage:
+      repository: ...
+      tag: ...
+    configReloadImage:
+      repository: ...
+      tag: ...
+    metricsExporterImage:
+      repository: ...
+      tag: ...
+    bufferVolumeMetricsImage:
+      repository: ...
+      tag: ...
+    ```
+
+- When using the [Kafka Fluentd output]({{< relref "/docs/configuration/plugins/outputs/kafka.md#kafka-max_send_limit_bytes" >}}), you can now set the maximal size of the messages using the `max_send_limit_bytes` option.
+
 ## Version 4.9
 
 The following are the highlights and main changes of Logging operator 4.9. For a complete list of changes and bugfixes, see the [Logging operator 4.9 releases page](https://github.com/kube-logging/logging-operator/releases/tag/4.9.0)<!-- and the [Logging operator 4.9 release blog post](https://axoflow.com/logging-operator-4.9-release)-->.