Update changelog for 14.0.8

[ci skip]

CHANGELOG.md

@@ -1181,6 +1181,20 @@ entry.
 - [Remove diffs gradual load feature flag](gitlab-org/gitlab@027d7c4327b5b6205a84281239027273517bf81b) ([merge request](gitlab-org/gitlab!55478))
 - [Remove partial index for Hashed Storage migration](gitlab-org/gitlab@3ed017a1023d7b0941a7606b69e6caee8d22f15c) ([merge request](gitlab-org/gitlab!62920))
 
+## 14.0.8 (2021-08-25)
+
+### Fixed (1 change)
+
+- [Fix: Sidekiq workers delete each other's metrics](gitlab-org/gitlab@98a85fcbcdf2f8dfef83e552a850591e8952c057) ([merge request](gitlab-org/gitlab!68761))
+
+### Changed (1 change)
+
+- [Resolve "operator does not exist: integer[] || bigint in...](gitlab-org/gitlab@273cc43f7928e89fd11237b58fdfdfb8a24e5493) ([merge request](gitlab-org/gitlab!68761))
+
+### Other (1 change)
+
+- [Revert backfill on ci_build_trace_sections](gitlab-org/gitlab@10a5ad9dce9014eb8af6493402dcdd1658dbd62a) ([merge request](gitlab-org/gitlab!68761))
+
 ## 14.0.7 (2021-08-03)
 
 ### Security (18 changes)