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docs: mention vmagent and vmgateway changes

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docs/CHANGELOG.md
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@ -60,6 +60,8 @@ See also [LTS releases](https://docs.victoriametrics.com/lts-releases/).
* FEATURE: [vmbackup](https://docs.victoriametrics.com/vmbackup/index.html): allow overriding Azure storage domain when performing backups. See configuration docs [here](https://docs.victoriametrics.com/vmbackup/#providing-credentials-via-env-variables). See [this issue](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/5984) for the details. Thanks to @justinrush for the [pull request](https://github.com/VictoriaMetrics/VictoriaMetrics/pull/6518).
* FEATURE: [streaming aggregation](https://docs.victoriametrics.com/stream-aggregation/): prevent having duplicated aggregation function as `outputs` in one [aggregation config](https://docs.victoriametrics.com/stream-aggregation/#stream-aggregation-config). It also prevents using `outputs: ["quantiles(0.5)", "quantiles(0.9)"]` instead of `outputs: ["quantiles(0.5, 0.9)"]`, as the former has higher computation cost for producing the same result.
* BUGFIX: [vmagent](https://docs.victoriametrics.com/vmagent/): fix panic when using multiple topics with the same name when [ingesting metrics from Kafka](https://docs.victoriametrics.com/vmagent/#kafka-integration). See [this issue](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/6636) for the details.
* BUGFIX: [vmgateway](https://docs.victoriametrics.com/vmgateway/): properly apply read and write based rate limits. See this [issue](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/6148) for details.
* BUGFIX: [docker-compose](https://github.com/VictoriaMetrics/VictoriaMetrics/tree/master/deployment/docker#docker-compose-environment-for-victoriametrics): fix incorrect link to vmui from [VictoriaMetrics plugin in Grafana](https://github.com/VictoriaMetrics/VictoriaMetrics/tree/master/deployment/docker#grafana).
* BUGFIX: [docker-compose](https://github.com/VictoriaMetrics/VictoriaMetrics/tree/master/deployment/docker#docker-compose-environment-for-victoriametrics): fix incorrect link to vmui from [VictoriaMetrics plugin in Grafana](https://github.com/VictoriaMetrics/VictoriaMetrics/tree/master/deployment/docker#grafana).
* BUGFIX: [Single-node VictoriaMetrics](https://docs.victoriametrics.com/) and `vmstorage` in [VictoriaMetrics cluster](https://docs.victoriametrics.com/cluster-victoriametrics/): Fix the dateMetricIDCache consistency issue that leads to duplicate per-day index entries when new time series are inserted concurrently. See [this issue](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/6534) for details.

19
docs/vmagent.md
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@ -1444,7 +1444,24 @@ by passing multiple `-kafka.consumer.topic` command-line flags to `vmagent`.
`vmagent` consumes messages from Kafka brokers specified by `-kafka.consumer.topic.brokers` command-line flag.
Multiple brokers can be specified per each `-kafka.consumer.topic` by passing a list of brokers delimited by `;`.
For example, `-kafka.consumer.topic.brokers='host1:9092;host2:9092'`.
For example:
```sh
./bin/vmagent
-kafka.consumer.topic='topic-a'
-kafka.consumer.topic.brokers='host1:9092;host2:9092'
-kafka.consumer.topic='topic-b'
-kafka.consumer.topic.brokers='host3:9092;host4:9092'
```
This command starts `vmagent` which reads messages from `topic-a` at `host1:9092` and `host2:9092` brokers and messages
from `topic-b` at `host3:9092` and `host4:9092` brokers.
Note that when using YAML configuration (for example, when using [Helm charts](https://github.com/VictoriaMetrics/helm-charts) or [Kubernetes operator](https://docs.victoriametrics.com/operator/))
keys provided in `extraArgs` must be unique, so in order to achieve the same configuration as in the example above, the following configuration must be used:
```yaml
extraArgs:
"kafka.consumer.topic": "topic-a,topic-b"
"kafka.consumer.topic.brokers": "host1:9092;host2:9092,host3:9092;host4:9092"
```
Note that list of brokers for the same topic is separated by `;` and different groups of brokers are separated by `,`.
The following command starts `vmagent`, which reads metrics in InfluxDB line protocol format from Kafka broker at `localhost:9092`
from the topic `metrics-by-telegraf` and sends them to remote storage at `http://localhost:8428/api/v1/write`: