docs/CHANGELOG.md: document v1.97.4 LTS release

See https://github.com/VictoriaMetrics/VictoriaMetrics/releases/tag/v1.97.4
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Aliaksandr Valialkin 2024-04-19 13:10:19 +02:00
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* BUGFIX: [dashboards](https://grafana.com/orgs/victoriametrics): update `Storage full ETA` panels for Single-node and Cluster dashboards to prevent them from showing negative or blank results caused by increase of deduplicated samples. Deduplicated samples were part of the expression to provide a better estimate for disk usage, but due to sporadic nature of [deduplication](https://docs.victoriametrics.com/#deduplication) in VictoriaMetrics it rather produced skewed results. See [this pull request](https://github.com/VictoriaMetrics/VictoriaMetrics/pull/5747).
* BUGFIX: [vmalert](https://docs.victoriametrics.com/#vmalert): reduce memory usage for ENT version of vmalert for configurations with high number of groups with enabled multitenancy.
## [v1.97.4](https://github.com/VictoriaMetrics/VictoriaMetrics/releases/tag/v1.97.4)
Released at 2024-04-19
**v1.97.x is a line of [LTS releases](https://docs.victoriametrics.com/lts-releases/). It contains important up-to-date bugfixes for [VictoriaMetrics enterprise](https://docs.victoriametrics.com/enterprise/).
All these fixes are also included in [the latest community release](https://github.com/VictoriaMetrics/VictoriaMetrics/releases/latest).
The v1.97.x line will be supported for at least 12 months since [v1.97.0](https://docs.victoriametrics.com/changelog/#v1970) release**
* SECURITY: upgrade Go builder from Go1.21.7 to Go1.22.2. See [the list of issues addressed in Go1.22.1](https://github.com/golang/go/issues?q=milestone%3AGo1.22.1+label%3ACherryPickApproved) and [the list of issues addressed in Go1.22.2](https://github.com/golang/go/issues?q=milestone%3AGo1.22.2+label%3ACherryPickApproved).
* BUGFIX: prevent from automatic deletion of newly registered time series when it is queried immediately after the addition. See [this](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/5948) and [this](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/5959) issue.
* BUGFIX: [vmagent](https://docs.victoriametrics.com/vmagent/): properly set `Host` header in requests to scrape targets when [`server_name` option at `tls_config`](https://prometheus.io/docs/prometheus/latest/configuration/configuration/#tls_config) is set. Previously the `Host` header was set incorrectly to the target hostname in this case.
* BUGFIX: [vmagent](https://docs.victoriametrics.com/vmagent/): properly set `Host` header in requests to scrape targets if it is specified via [`headers` option](https://docs.victoriametrics.com/sd_configs/#http-api-client-options). Thanks to @fholzer for [the bugreport](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/5969) and [the fix](https://github.com/VictoriaMetrics/VictoriaMetrics/pull/5970).
* BUGFIX: [vmalert](https://docs.victoriametrics.com/vmalert/): set correct `endsAt` value in notifications sent to the Alertmanager. Previously, a rule with evaluation intervals lower than 10s could never be triggered. See [this issue](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/5995) for details.
* BUGFIX: [vmalert](https://docs.victoriametrics.com/vmalert/): properly account for `-rule.resendDelay` for alerting rules that are constantly switching state from inactive to firing. Before, notifications for such rules could have been skipped if state change happened more often than `-rule.resendDelay`. See [this pull request](https://github.com/VictoriaMetrics/VictoriaMetrics/pull/6028) for details.
* BUGFIX: [vmalert](https://docs.victoriametrics.com/vmalert/): respect `-remoteWrite.maxBatchSize` at shutdown period. See [this issue](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/6025). Thanks to @jiekun for [the pull request](https://github.com/VictoriaMetrics/VictoriaMetrics/pull/6039).
* BUGFIX: [vmalert](https://docs.victoriametrics.com/vmalert/): supported any status codes from the range 200-299 from alertmanager. Previously, only 200 status code considered a successful action. See [this issue](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/6110).
* BUGFIX: [vmalert](https://docs.victoriametrics.com/vmalert/): avoid blocking `/api/v1/rules`, `/api/v1/alerts`, `/metrics` APIs when alerting rule uses template functions `query`, which could takes a while to execute. See [this issue](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/6079).
* BUGFIX: [vmbackupmanager](https://docs.victoriametrics.com/vmbackupmanager/): fix panic when performing a restore from GCS. Previously, filters for GCS objects were not properly set which caused objects to be returned instead of prefixes.
## [v1.97.3](https://github.com/VictoriaMetrics/VictoriaMetrics/releases/tag/v1.97.3)
Released at 2024-03-01

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## Currently supported LTS release lines
- 1.97.x - the latest one is [v1.97.3 LTS release](https://github.com/VictoriaMetrics/VictoriaMetrics/releases/tag/v1.97.3)
- 1.97.x - the latest one is [v1.97.4 LTS release](https://github.com/VictoriaMetrics/VictoriaMetrics/releases/tag/v1.97.4)
- 1.93.x - the latest one is [v1.93.14 LTS release](https://github.com/VictoriaMetrics/VictoriaMetrics/releases/tag/v1.93.14)