app/vminsert: increase default value for -maxLabelValueLen command-line flag from 1KiB to 4KiB

It has been appeared that the standard Kubernetes monitoring can generate labels with sizes up to 4KiB

This is a follow-up for a5d1013042
Updates https://github.com/VictoriaMetrics/VictoriaMetrics/issues/6176

README.md

@@ -2880,7 +2880,7 @@ Pass `-help` to VictoriaMetrics in order to see the list of supported command-li
      The maximum size in bytes of a single Prometheus remote_write API request
      Supports the following optional suffixes for size values: KB, MB, GB, TB, KiB, MiB, GiB, TiB (default 33554432)
   -maxLabelValueLen int
-     The maximum length of label values in the accepted time series. Longer label values are truncated. In this case the vm_too_long_label_values_total metric at /metrics page is incremented (default 1024)
+     The maximum length of label values in the accepted time series. Longer label values are truncated. In this case the vm_too_long_label_values_total metric at /metrics page is incremented (default 4096)
   -maxLabelsPerTimeseries int
      The maximum number of labels accepted per time series. Superfluous labels are dropped. In this case the vm_metrics_with_dropped_labels_total metric at /metrics page is incremented (default 30)
   -memory.allowedBytes size

app/vminsert/main.go

@@ -67,7 +67,7 @@ var (
 	configAuthKey          = flagutil.NewPassword("configAuthKey", "Authorization key for accessing /config page. It must be passed via authKey query arg. It overrides httpAuth.* settings.")
 	reloadAuthKey          = flagutil.NewPassword("reloadAuthKey", "Auth key for /-/reload http endpoint. It must be passed via authKey query arg. It overrides httpAuth.* settings.")
 	maxLabelsPerTimeseries = flag.Int("maxLabelsPerTimeseries", 30, "The maximum number of labels accepted per time series. Superfluous labels are dropped. In this case the vm_metrics_with_dropped_labels_total metric at /metrics page is incremented")
-	maxLabelValueLen       = flag.Int("maxLabelValueLen", 1024, "The maximum length of label values in the accepted time series. Longer label values are truncated. In this case the vm_too_long_label_values_total metric at /metrics page is incremented")
+	maxLabelValueLen       = flag.Int("maxLabelValueLen", 4*1024, "The maximum length of label values in the accepted time series. Longer label values are truncated. In this case the vm_too_long_label_values_total metric at /metrics page is incremented")
 )
 
 var (

docs/CHANGELOG.md

@@ -108,7 +108,7 @@ Released at 2024-06-07
 
 **Update note 2: the `-streamAggr.dropInputLabels` command-line flag at `vmagent` was renamed to `-remoteWrite.streamAggr.dropInputLabels`. `-streamAggr.dropInputLabels` is now used for global streaming aggregation.**
 
-**Update note 3: the `-maxLabelValueLen` command-line flag default value was changed from 16kB to 1kB. It may lead to truncating of labels with enormous values.**
+**Update note 3: the `-maxLabelValueLen` command-line flag default value was changed from 16KiB to 4KiB. It may lead to truncating of labels with too long values.**
 
 * SECURITY: upgrade Go builder from Go1.22.2 to Go1.22.4. See the list of issues addressed in [Go1.22.3](https://github.com/golang/go/issues?q=milestone%3AGo1.22.3+label%3ACherryPickApproved) and [Go1.22.4](https://github.com/golang/go/issues?q=milestone%3AGo1.22.4+label%3ACherryPickApproved).
 * SECURITY: upgrade base docker image (Alpine) from 3.19.1 to 3.20.0. See [alpine 3.20.0 release notes](https://www.alpinelinux.org/posts/Alpine-3.20.0-released.html).
@@ -1124,4 +1124,3 @@ See changes [here](https://docs.victoriametrics.com/changelog_2020/#v1420)
 ## Previous releases
 
 See [releases page](https://github.com/VictoriaMetrics/VictoriaMetrics/releases).
-

docs/Cluster-VictoriaMetrics.md

@@ -12,9 +12,9 @@ aliases:
 # Cluster version
 
 <picture>
-  <source media="(prefers-color-scheme: dark)" srcset="logo_white.webp">
-  <source media="(prefers-color-scheme: light)" srcset="logo.webp">
-  <img width="300" alt="VictoriaMetrics logo" src="logo.webp">
+  <source srcset="logo_white.webp" media="(prefers-color-scheme: dark)">
+  <source srcset="logo.webp" media="(prefers-color-scheme: light)">
+  <img src="logo.webp" width="300" alt="VictoriaMetrics logo">
 </picture>
 
 VictoriaMetrics is a fast, cost-effective and scalable time series database. It can be used as a long-term remote storage for Prometheus.
@@ -1189,7 +1189,7 @@ Below is the output for `/path/to/vminsert -help`:
      The maximum size in bytes of a single Prometheus remote_write API request
      Supports the following optional suffixes for size values: KB, MB, GB, TB, KiB, MiB, GiB, TiB (default 33554432)
   -maxLabelValueLen int
-     The maximum length of label values in the accepted time series. Longer label values are truncated. In this case the vm_too_long_label_values_total metric at /metrics page is incremented (default 16384)
+     The maximum length of label values in the accepted time series. Longer label values are truncated. In this case the vm_too_long_label_values_total metric at /metrics page is incremented (default 4096)
   -maxLabelsPerTimeseries int
      The maximum number of labels accepted per time series. Superfluous labels are dropped. In this case the vm_metrics_with_dropped_labels_total metric at /metrics page is incremented (default 30)
   -memory.allowedBytes size

docs/README.md

@@ -2883,7 +2883,7 @@ Pass `-help` to VictoriaMetrics in order to see the list of supported command-li
      The maximum size in bytes of a single Prometheus remote_write API request
      Supports the following optional suffixes for size values: KB, MB, GB, TB, KiB, MiB, GiB, TiB (default 33554432)
   -maxLabelValueLen int
-     The maximum length of label values in the accepted time series. Longer label values are truncated. In this case the vm_too_long_label_values_total metric at /metrics page is incremented (default 1024)
+     The maximum length of label values in the accepted time series. Longer label values are truncated. In this case the vm_too_long_label_values_total metric at /metrics page is incremented (default 4096)
   -maxLabelsPerTimeseries int
      The maximum number of labels accepted per time series. Superfluous labels are dropped. In this case the vm_metrics_with_dropped_labels_total metric at /metrics page is incremented (default 30)
   -memory.allowedBytes size

docs/Single-server-VictoriaMetrics.md

@@ -2891,7 +2891,7 @@ Pass `-help` to VictoriaMetrics in order to see the list of supported command-li
      The maximum size in bytes of a single Prometheus remote_write API request
      Supports the following optional suffixes for size values: KB, MB, GB, TB, KiB, MiB, GiB, TiB (default 33554432)
   -maxLabelValueLen int
-     The maximum length of label values in the accepted time series. Longer label values are truncated. In this case the vm_too_long_label_values_total metric at /metrics page is incremented (default 1024)
+     The maximum length of label values in the accepted time series. Longer label values are truncated. In this case the vm_too_long_label_values_total metric at /metrics page is incremented (default 4096)
   -maxLabelsPerTimeseries int
      The maximum number of labels accepted per time series. Superfluous labels are dropped. In this case the vm_metrics_with_dropped_labels_total metric at /metrics page is incremented (default 30)
   -memory.allowedBytes size

docs/keyConcepts.md

@@ -349,7 +349,7 @@ This limit can be changed via `-maxLabelsPerTimeseries` command-line flag if nec
 Every label value can contain an arbitrary string value. The good practice is to use short and meaningful label values to
 describe the attribute of the metric, not to tell the story about it. For example, label-value pair
 `environment="prod"` is ok, but `log_message="long log message with a lot of details..."` is not ok. By default,
-VictoriaMetrics limits label's value size with 1kB. This limit can be changed via `-maxLabelValueLen` command-line flag.
+VictoriaMetrics limits label's value size with 4KiB. This limit can be changed via `-maxLabelValueLen` command-line flag.
 
 It is very important to keep under control the number of unique label values, since every unique label value
 leads to a new [time series](#time-series). Try to avoid using volatile label values such as session ID or query ID in order to