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docs: add CHANGELOG.md
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Aliaksandr Valialkin
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@ -175,3 +175,4 @@ docs-sync:
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cp app/vmbackup/README.md docs/vmbackup.md
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cp app/vmrestore/README.md docs/vmrestore.md
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cp README.md docs/Cluster-VictoriaMetrics.md
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cp CHANGELOG.md docs/
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docs/CHANGELOG.md
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docs/CHANGELOG.md
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# tip
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* FEATURE: optimize requests to `/api/v1/labels` and `/api/v1/label/<name>/values` when `start` and `end` args are set.
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* FEATURE: reduce memory usage when query touches big number of time series.
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* FEATURE: vmagent: reduce memory usage when `kubernetes_sd_config` discovers big number of scrape targets (e.g. hundreds of thouthands) and the majority of these targets (99%)
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are dropped during relabeling. Previously labels for all the dropped targets were displayed at `/api/v1/targets` page. Now only up to `-promscrape.maxDroppedTargets` such
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targets are displayed. See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/878 for details.
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* FEATURE: vmagent: add `/ready` HTTP endpoint, which returns 200 OK status code when all the service discovery has been initialized.
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This may be useful during rolling upgrades. See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/875
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# [v1.45.0](https://github.com/VictoriaMetrics/VictoriaMetrics/releases/tag/v1.45.0)
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* FEATURE: allow setting `-retentionPeriod` smaller than one month. I.e. `-retentionPeriod=3d`, `-retentionPeriod=2w`, etc. is supported now.
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See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/173
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* FEATURE: optimize more cases according to https://utcc.utoronto.ca/~cks/space/blog/sysadmin/PrometheusLabelNonOptimization . Now the following cases are optimized too:
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* `rollup_func(foo{filters}[d]) op bar` -> `rollup_func(foo{filters}[d]) op bar{filters}`
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* `transform_func(foo{filters}) op bar` -> `transform_func(foo{filters}) op bar{filters}`
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* `num_or_scalar op foo{filters} op bar` -> `num_or_scalar op foo{filters} op bar{filters}`
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* FEATURE: improve time series search for queries with multiple label filters. I.e. `foo{label1="value", label2=~"regexp"}`.
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See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/781
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* FEATURE: vmagent: add `stream parse` mode. This mode allows reducing memory usage when individual scrape targets expose tens of millions of metrics.
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For example, during scraping Prometheus in [federation](https://prometheus.io/docs/prometheus/latest/federation/) mode.
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See `-promscrape.streamParse` command-line option and `stream_parse: true` config option for `scrape_config` section in `-promscrape.config`.
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See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/825 and [troubleshooting docs for vmagent](https://victoriametrics.github.io/vmagent.html#troubleshooting).
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* FEATURE: vmalert: add `-dryRun` command-line option for validating the provided config files without the need to start `vmalert` service.
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* FEATURE: accept optional third argument of string type at `topk_*` and `bottomk_*` functions. This is label name for additional time series to return with the sum of time series outside top/bottom K. See [MetricsQL docs](https://victoriametrics.github.io/MetricsQL.html) for more details.
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* FEATURE: vmagent: expose `/api/v1/targets` page according to [the corresponding Prometheus API](https://prometheus.io/docs/prometheus/latest/querying/api/#targets).
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See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/643
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* BUGFIX: vmagent: properly handle OpenStack endpoint ending with `v3.0` such as `https://ostack.example.com:5000/v3.0`
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in the same way as Prometheus does. See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/728#issuecomment-709914803
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* BUGFIX: drop trailing data points for time series with a single raw sample. See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/748
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* BUGFIX: do not drop trailing data points for instant queries to `/api/v1/query`. See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/845
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* BUGFIX: vmbackup: fix panic when `-origin` isn't specified. See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/856
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* BUGFIX: vmalert: skip automatically added labels on alerts restore. Label `alertgroup` was introduced in [this issue](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/611)
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and automatically added to generated time series. By mistake, this new label wasn't correctly purged on restore event and affected alert's ID uniqueness.
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See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/870
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* BUGFIX: vmagent: fix panic at scrape error body formating. See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/864
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* BUGFIX: vmagent: add leading missing slash to metrics path like Prometheus does. See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/835
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* BUGFIX: vmagent: drop packet if remote storage returns 4xx status code. This make the behaviour consistent with Prometheus.
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See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/873
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* BUGFIX: vmagent: properly handle 301 redirects. See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/869
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# [v1.44.0](https://github.com/VictoriaMetrics/VictoriaMetrics/releases/tag/v1.44.0)
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* FEATURE: automatically add missing label filters to binary operands as described at https://utcc.utoronto.ca/~cks/space/blog/sysadmin/PrometheusLabelNonOptimization .
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This should improve performance for queries with missing label filters in binary operands. For example, the following query should work faster now, because it shouldn't
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fetch and discard time series for `node_filesystem_files_free` metric without matching labels for the left side of the expression:
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```
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node_filesystem_files{ host="$host", mountpoint="/" } - node_filesystem_files_free
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```
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* FEATURE: vmagent: add Docker Swarm service discovery (aka [dockerswarm_sd_config](https://prometheus.io/docs/prometheus/latest/configuration/configuration/#dockerswarm_sd_config)).
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See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/656
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* FEATURE: add ability to export data in CSV format. See [these docs](https://victoriametrics.github.io/#how-to-export-csv-data) for details.
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* FEATURE: vmagent: add `-promscrape.suppressDuplicateScrapeTargetErrors` command-line flag for suppressing `duplicate scrape target` errors.
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See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/651 and https://victoriametrics.github.io/vmagent.html#troubleshooting .
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* FEATURE: vmagent: show original labels before relabeling is applied on `duplicate scrape target` errors. This should simplify debugging for incorrect relabeling.
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See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/651
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* FEATURE: vmagent: `/targets` page now accepts optional `show_original_labels=1` query arg for displaying original labels for each target before relabeling is applied.
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This should simplify debugging for target relabeling configs. See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/651
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* FEATURE: add `-finalMergeDelay` command-line flag for configuring the delay before final merge for per-month partitions.
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The final merge is started after no new data is ingested into per-month partition during `-finalMergeDelay`.
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* FEATURE: add `vm_rows_added_to_storage_total` metric, which shows the total number of rows added to storage since app start.
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The `sum(rate(vm_rows_added_to_storage_total))` can be smaller than `sum(rate(vm_rows_inserted_total))` if certain metrics are dropped
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due to [relabeling](https://victoriametrics.github.io/#relabeling). The `sum(rate(vm_rows_added_to_storage_total))` can be bigger
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than `sum(rate(vm_rows_inserted_total))` if [replication](https://victoriametrics.github.io/Cluster-VictoriaMetrics.html#replication-and-data-safety) is enabled.
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* FEATURE: keep metric name after applying [MetricsQL](https://victoriametrics.github.io/MetricsQL.html) functions, which don't change time series meaning.
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The list of such functions:
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* `keep_last_value`
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* `keep_next_value`
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* `interpolate`
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* `running_min`
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* `running_max`
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* `running_avg`
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* `range_min`
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* `range_max`
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* `range_avg`
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* `range_first`
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* `range_last`
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* `range_quantile`
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* `smooth_exponential`
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* `ceil`
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* `floor`
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* `round`
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* `clamp_min`
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* `clamp_max`
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* `max_over_time`
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* `min_over_time`
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* `avg_over_time`
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* `quantile_over_time`
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* `mode_over_time`
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* `geomean_over_time`
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* `holt_winters`
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* `predict_linear`
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See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/674
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* BUGFIX: properly handle stale time series after K8S deployment. Previously such time series could be double-counted.
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See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/748
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* BUGFIX: return a single time series at max from `absent()` function like Prometheus does.
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* BUGFIX: vmalert: accept days, weeks and years in `for: ` part of config like Prometheus does. See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/817
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* BUGFIX: fix `mode_over_time(m[d])` calculations. Previously the function could return incorrect results.
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# [v1.43.0](https://github.com/VictoriaMetrics/VictoriaMetrics/releases/tag/v1.43.0)
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* FEATURE: reduce CPU usage for repeated queries over sliding time window when no new time series are added to the database.
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Typical use cases: repeated evaluation of alerting rules in [vmalert](https://victoriametrics.github.io/vmalert.html) or dashboard auto-refresh in Grafana.
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* FEATURE: vmagent: add OpenStack service discovery aka [openstack_sd_config](https://prometheus.io/docs/prometheus/latest/configuration/configuration/#openstack_sd_config).
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See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/728 .
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* FEATURE: vmalert: make `-maxIdleConnections` configurable for datasource HTTP client. This option can be used for minimizing connection churn.
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See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/795 .
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* FEATURE: add `-influx.maxLineSize` command-line flag for configuring the maximum size for a single Influx line during parsing.
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See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/807
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* BUGFIX: properly handle `inf` values during [background merge of LSM parts](https://medium.com/@valyala/how-victoriametrics-makes-instant-snapshots-for-multi-terabyte-time-series-data-e1f3fb0e0282).
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Previously `Inf` values could result in `NaN` values for adjancent samples in time series. See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/805 .
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* BUGFIX: fill gaps on graphs for `range_*` and `running_*` functions. See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/806 .
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* BUGFIX: make a copy of label with new name during relabeling with `action: labelmap` in the same way as Prometheus does.
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Previously the original label name has been replaced. See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/812 .
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* BUGFIX: support parsing floating-point timestamp like Graphite Carbon does. Such timestmaps are truncated to seconds.
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# [v1.42.0](https://github.com/VictoriaMetrics/VictoriaMetrics/releases/tag/v1.42.0)
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* FEATURE: use all the available CPU cores when accepting data via a single TCP connection
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for [all the supported protocols](https://victoriametrics.github.io/#how-to-import-time-series-data).
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Previously data ingested via a single TCP connection could use only a single CPU core. This could limit data ingestion performance.
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The main benefit of this feature is that data can be imported at max speed via a single connection - there is no need to open multiple concurrent
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connections to VictoriaMetrics or [vmagent](https://victoriametrics.github.io/vmagent.html) in order to achieve the maximum data ingestion speed.
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* FEATURE: cluster: improve performance for data ingestion path from `vminsert` to `vmstorage` nodes. The maximum data ingestion performance
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for a single connection between `vminsert` and `vmstorage` node scales with the number of available CPU cores on `vmstorage` side.
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This should help with https://github.com/VictoriaMetrics/VictoriaMetrics/issues/791 .
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* FEATURE: add ability to export / import data in native format via `/api/v1/export/native` and `/api/v1/import/native`.
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This is the most optimized approach for data migration between VictoriaMetrics instances. Both single-node and cluster instances are supported.
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See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/787#issuecomment-700632551 .
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* FEATURE: add `reduce_mem_usage` query option to `/api/v1/export` in order to reduce memory usage during data export / import.
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See [these docs](https://victoriametrics.github.io/#how-to-export-data-in-json-line-format) for details.
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* FEATURE: improve performance for `/api/v1/series` handler when it returns big number of time series.
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* FEATURE: add `vm_merge_need_free_disk_space` metric, which can be used for estimating the number of deferred background data merges due to the lack of free disk space.
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See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/686 .
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* FEATURE: add OpenBSD support. See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/785 .
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* BUGFIX: properly apply `-search.maxStalenessInterval` command-line flag value. See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/784 .
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* BUGFIX: fix displaying data in Grafana tables. See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/720 .
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* BUGFIX: do not adjust the number of detected CPU cores found at `/sys/devices/system/cpu/online`.
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The adjustement was increasing the resulting GOMAXPROC by 1, which looked confusing to users.
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See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/685#issuecomment-698595309 .
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* BUGFIX: vmagent: do not show `-remoteWrite.url` in initial logs if `-remoteWrite.showURL` isn't set. See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/773 .
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* BUGFIX: properly handle case when [/metrics/find](https://victoriametrics.github.io/#graphite-metrics-api-usage) finds both a leaf and a node for the given `query=prefix.*`.
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In this case only the node must be returned with stripped dot in the end of id as carbonapi does.
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# Previous releases
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See [releases page](https://github.com/VictoriaMetrics/VictoriaMetrics/releases).
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