Release notes: memory usage of connection and request statistics (#364)

* memory usage of connection and request statistics

* fix statement

Author: nerpaula

site/content/3.10/release-notes/version-3.10/whats-new-in-3-10.md

@@ -1593,9 +1593,28 @@ The following system metrics have been added:
 | `arangodb_file_descriptors_limit` | System limit for the number of open files for the arangod process. |
 | `arangodb_file_descriptors_current` | Number of file descriptors currently opened by the arangod process. |
 
+### Memory usage of connection and request statistics
+
+<small>Introduced in: v3.10.12</small>
+
+The following metrics have been added:
+
+| Label | Description |
+|:------|:------------|
+| `arangodb_connection_statistics_memory_usage` | Total memory usage of connection statistics. |
+| `arangodb_request_statistics_memory_usage` | Total memory usage of request statistics. |
+
+If the `--server.statistics` startup option is set to `true`, then some
+connection and request statistics are built up in memory for incoming request.
+It is expected that the memory usage reported by these metrics remains
+relatively constant over time. It may grow only when there are bursts of new
+connections. Some memory is pre-allocated at startup for higher efficiency. If the
+`--server.statistics` startup option is set to `false`, then no memory will be
+allocated for connection and request statistics.
+
 ### More instant Hot Backups
 
-<small>Introduced in: v3.10.10, v3.11.3</small>
+<small>Introduced in: v3.10.10</small>
 
 Cluster deployments no longer wait for all in-progress transactions to get
 committed when a user requests a Hot Backup. The waiting could cause deadlocks

site/content/3.11/release-notes/version-3.10/whats-new-in-3-10.md

@@ -1593,9 +1593,28 @@ The following system metrics have been added:
 | `arangodb_file_descriptors_limit` | System limit for the number of open files for the arangod process. |
 | `arangodb_file_descriptors_current` | Number of file descriptors currently opened by the arangod process. |
 
+### Memory usage of connection and request statistics
+
+<small>Introduced in: v3.10.12</small>
+
+The following metrics have been added:
+
+| Label | Description |
+|:------|:------------|
+| `arangodb_connection_statistics_memory_usage` | Total memory usage of connection statistics. |
+| `arangodb_request_statistics_memory_usage` | Total memory usage of request statistics. |
+
+If the `--server.statistics` startup option is set to `true`, then some
+connection and request statistics are built up in memory for incoming request.
+It is expected that the memory usage reported by these metrics remains
+relatively constant over time. It may grow only when there are bursts of new
+connections. Some memory is pre-allocated at startup for higher efficiency. If the
+`--server.statistics` startup option is set to `false`, then no memory will be
+allocated for connection and request statistics.
+
 ### More instant Hot Backups
 
-<small>Introduced in: v3.10.10, v3.11.3</small>
+<small>Introduced in: v3.10.10</small>
 
 Cluster deployments no longer wait for all in-progress transactions to get
 committed when a user requests a Hot Backup. The waiting could cause deadlocks

site/content/3.11/release-notes/version-3.11/whats-new-in-3-11.md

@@ -1267,7 +1267,7 @@ The following metrics have been added:
 
 ### Observability of in-memory cache subsystem
 
-<small>Introduced in: v3.10.11, v.3.11.4</small>
+<small>Introduced in: v3.10.11, v3.11.4</small>
 
 The following metrics have been added to improve the observability of in-memory
 cache subsystem:
@@ -1308,7 +1308,26 @@ The following startup option has been added:
 
 The following metric has been added:
 - `arangodb_scheduler_num_detached_threads`: The number of worker threads
-  currently started and detached from the scheduler. 
+  currently started and detached from the scheduler.
+
+### Memory usage of connection and request statistics
+
+<small>Introduced in: v3.10.12, v3.11.6</small>
+
+The following metrics have been added:
+
+| Label | Description |
+|:------|:------------|
+| `arangodb_connection_statistics_memory_usage` | Total memory usage of connection statistics. |
+| `arangodb_request_statistics_memory_usage` | Total memory usage of request statistics. |
+
+If the `--server.statistics` startup option is set to `true`, then some
+connection and request statistics are built up in memory for incoming request.
+It is expected that the memory usage reported by these metrics remains
+relatively constant over time. It may grow only when there are bursts of new
+connections. Some memory is pre-allocated at startup for higher efficiency. If the
+`--server.statistics` startup option is set to `false`, then no memory will be
+allocated for connection and request statistics.
 
 ## Client tools
 

site/content/3.12/release-notes/version-3.10/whats-new-in-3-10.md

@@ -1593,9 +1593,28 @@ The following system metrics have been added:
 | `arangodb_file_descriptors_limit` | System limit for the number of open files for the arangod process. |
 | `arangodb_file_descriptors_current` | Number of file descriptors currently opened by the arangod process. |
 
+### Memory usage of connection and request statistics
+
+<small>Introduced in: v3.10.12</small>
+
+The following metrics have been added:
+
+| Label | Description |
+|:------|:------------|
+| `arangodb_connection_statistics_memory_usage` | Total memory usage of connection statistics. |
+| `arangodb_request_statistics_memory_usage` | Total memory usage of request statistics. |
+
+If the `--server.statistics` startup option is set to `true`, then some
+connection and request statistics are built up in memory for incoming request.
+It is expected that the memory usage reported by these metrics remains
+relatively constant over time. It may grow only when there are bursts of new
+connections. Some memory is pre-allocated at startup for higher efficiency. If the
+`--server.statistics` startup option is set to `false`, then no memory will be
+allocated for connection and request statistics.
+
 ### More instant Hot Backups
 
-<small>Introduced in: v3.10.10, v3.11.3</small>
+<small>Introduced in: v3.10.10</small>
 
 Cluster deployments no longer wait for all in-progress transactions to get
 committed when a user requests a Hot Backup. The waiting could cause deadlocks

site/content/3.12/release-notes/version-3.11/whats-new-in-3-11.md

@@ -1267,7 +1267,7 @@ The following metrics have been added:
 
 ### Observability of in-memory cache subsystem
 
-<small>Introduced in: v3.10.11, v.3.11.4</small>
+<small>Introduced in: v3.10.11, v3.11.4</small>
 
 The following metrics have been added to improve the observability of in-memory
 cache subsystem:
@@ -1310,6 +1310,25 @@ The following metric has been added:
 - `arangodb_scheduler_num_detached_threads`: The number of worker threads
   currently started and detached from the scheduler. 
 
+### Memory usage of connection and request statistics
+
+<small>Introduced in: v3.10.12</small>
+
+The following metrics have been added:
+
+| Label | Description |
+|:------|:------------|
+| `arangodb_connection_statistics_memory_usage` | Total memory usage of connection statistics. |
+| `arangodb_request_statistics_memory_usage` | Total memory usage of request statistics. |
+
+If the `--server.statistics` startup option is set to `true`, then some
+connection and request statistics are built up in memory for incoming request.
+It is expected that the memory usage reported by these metrics remains
+relatively constant over time. It may grow only when there are bursts of new
+connections. Some memory is pre-allocated at startup for higher efficiency. If the
+`--server.statistics` startup option is set to `false`, then no memory will be
+allocated for connection and request statistics.
+
 ## Client tools
 
 ### arangodump