Add known issue for sublogger memory leak (#23977) (#24007)

* add known issue for sublogger memory leak

* update known issue

* Update website/content/partials/known-issues/ephemeral-loggers-memory-leak.mdx



* Update website/content/partials/known-issues/ephemeral-loggers-memory-leak.mdx



* Update website/content/partials/known-issues/ephemeral-loggers-memory-leak.mdx



---------

Co-authored-by: davidadeleon <56207066+davidadeleon@users.noreply.github.com>
Co-authored-by: Hamid Ghaf <83242695+hghaf099@users.noreply.github.com>
Co-authored-by: Jason O'Donnell <2160810+jasonodonnell@users.noreply.github.com>
Co-authored-by: Brian Kassouf <briankassouf@users.noreply.github.com>

website/content/docs/release-notes/1.13.0.mdx

@@ -122,6 +122,8 @@ The fix for this UI issue is coming in the Vault 1.13.1 release.
 
 @include 'known-issues/internal-error-namespace-missing-policy.mdx'
 
+@include 'known-issues/ephemeral-loggers-memory-leak.mdx'
+
 ## Feature deprecations and EOL
 
 Please refer to the [Deprecation Plans and Notice](/vault/docs/deprecation) page

website/content/docs/upgrading/upgrade-to-1.13.x.mdx

@@ -184,3 +184,5 @@ Affects Vault 1.13.0+
 @include 'known-issues/transit-managed-keys-panics.mdx'
 
 @include 'known-issues/internal-error-namespace-missing-policy.mdx'
+
+@include 'known-issues/ephemeral-loggers-memory-leak.mdx'

website/content/partials/known-issues/ephemeral-loggers-memory-leak.mdx

@@ -0,0 +1,14 @@
+### Vault is storing references to ephemeral sub-loggers leading to a memory leak
+
+Vault is unexpectedly storing references to ephemeral sub-loggers which prevents them from being cleaned up, leading to
+a memory leak. This impacts many areas of Vault, but primarily logins in Enterprise.
+There is no workaround.
+
+#### Affected versions
+
+This issue affects Vault Community and Enterprise versions:
+- 1.13.7+
+- 1.14.3+
+- 1.15.0+
+
+A fix will be issued in the next release