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docs: clarify that vminsert also supports exponential histogram parsing

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Signed-off-by: hagen1778 <roman@victoriametrics.com>
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docs/changelog/CHANGELOG.md
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@ -27,7 +27,7 @@ Released at 2024-10-21
**Update note 1: `-search.maxUniqueTimeseries` limit on `vmselect` can no longer exceed `-search.maxUniqueTimeseries` limit on `vmstorage`. If you don't set this flag at `vmstorage`, then it will be automatically calculated based on available resources. This can result into rejecting expensive read queries if they exceed auto-calculated limit. The limit can be overriden by manually setting `-search.maxUniqueTimeseries` at vmstorage, but for better reliability we recommend sticking to default values. Refer to the CHANGELOG below and [this issue](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/6930).**
* FEATURE: [vmagent](https://docs.victoriametrics.com/vmagent/) and [Single-node VictoriaMetrics](https://docs.victoriametrics.com/): add support of [exponential histograms](https://opentelemetry.io/docs/specs/otel/metrics/data-model/#exponentialhistogram) ingested via [OpenTelemetry protocol for metrics](https://docs.victoriametrics.com/#sending-data-via-opentelemetry). Such histograms will be automatically converted to [VictoriaMetrics histogram format](https://valyala.medium.com/improving-histogram-usability-for-prometheus-and-grafana-bc7e5df0e350). See [this pull request](https://github.com/VictoriaMetrics/VictoriaMetrics/pull/6354).
* FEATURE: [vmsingle](https://docs.victoriametrics.com/single-server-victoriametrics/), `vminsert` in [VictoriaMetrics cluster](https://docs.victoriametrics.com/cluster-victoriametrics/) and [vmagent](https://docs.victoriametrics.com/vmagent/): add support of [exponential histograms](https://opentelemetry.io/docs/specs/otel/metrics/data-model/#exponentialhistogram) ingested via [OpenTelemetry protocol for metrics](https://docs.victoriametrics.com/#sending-data-via-opentelemetry). Such histograms will be automatically converted to [VictoriaMetrics histogram format](https://valyala.medium.com/improving-histogram-usability-for-prometheus-and-grafana-bc7e5df0e350). See [this pull request](https://github.com/VictoriaMetrics/VictoriaMetrics/pull/6354).
* FEATURE: [Single-node VictoriaMetrics](https://docs.victoriametrics.com/) and `vmstorage` in [VictoriaMetrics cluster](https://docs.victoriametrics.com/cluster-victoriametrics/): automatically set `-search.maxUniqueTimeseries` limit based on available memory and `-search.maxConcurrentRequests`. The more memory is available to the process and the lower is `-search.maxConcurrentRequests`, the higher will be `-search.maxUniqueTimeseries` limit. This should protect vmstorage from expensive queries without the need to manually set `-search.maxUniqueTimeseries`. The calculated limit will be printed during process start-up logs and exposed as `vm_search_max_unique_timeseries` metric. Set `-search.maxUniqueTimeseries` manually to override auto calculation. Please note, `-search.maxUniqueTimeseries` on vmselect can't exceed the same name limit on vmstorage, it can only be set to lower values. See [this issue](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/6930).
* FEATURE: [vmsingle](https://docs.victoriametrics.com/single-server-victoriametrics/), `vminsert` in [VictoriaMetrics cluster](https://docs.victoriametrics.com/cluster-victoriametrics/) and [vmagent](https://docs.victoriametrics.com/vmagent/): disable stream processing mode for data [ingested via InfluxDB](https://docs.victoriametrics.com/#how-to-send-data-from-influxdb-compatible-agents-such-as-telegraf) HTTP endpoints by default. With this change, the data is processed in batches (see `-influx.maxRequestSize`) and user will get parsing errors immediately as they happen. This also improves users' experience and resiliency against thundering herd problems caused by clients without backoff policies like telegraf. To enable stream mode back, pass HTTP header `Stream-Mode: "1"` with each request. For data sent via TCP and UDP (see `-influxListenAddr`) protocols streaming processing remains enabled.
* FEATURE: `vmselect` in [VictoriaMetrics cluster](https://docs.victoriametrics.com/cluster-victoriametrics/): set default value for `-search.maxUniqueTimeseries` to `0`. See [this issue](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/6930).