Merge pull request #13264 from smartcontractkit/chore/update-release-…

…2.12.0-changelog-bugfixes

Update CHANGELOG for 2.12.0 bugfixes

CHANGELOG.md

@@ -1,9 +1,12 @@
 # Changelog Chainlink Core
 
+
 ## 2.12.0 - UNRELEASED
 
 ### Minor Changes
 
+- [#13246](https://github.com/smartcontractkit/chainlink/pull/13246) [`119df08eec`](https://github.com/smartcontractkit/chainlink/commit/119df08eec3609a41880a5b471c466e90fff36f8) Thanks [@ilija42](https://github.com/ilija42)! - Added a mechanism to validate forwarders for OCR2 and fallback to EOA if necessary #added
+
 - [#13000](https://github.com/smartcontractkit/chainlink/pull/13000) [`1b994043b0`](https://github.com/smartcontractkit/chainlink/commit/1b994043b00cad9e0c900b6d12173dd1008480a5) Thanks [@ettec](https://github.com/ettec)! - #internal changes to core required by change BCF3168 in common to add relayer set
 
 - [#12867](https://github.com/smartcontractkit/chainlink/pull/12867) [`27d9413286`](https://github.com/smartcontractkit/chainlink/commit/27d941328655e0cde608c1eff47de736c11e2e58) Thanks [@dhaidashenko](https://github.com/dhaidashenko)! - Added a new CLI command, `blocks find-lca,` which finds the latest block that is available in both the database and on the chain for the specified chain.
@@ -41,6 +44,15 @@
 
 ### Patch Changes
 
+- [#13260](https://github.com/smartcontractkit/chainlink/pull/13260) [`5daefad14c`](https://github.com/smartcontractkit/chainlink/commit/5daefad14c42011ad0c19d9c21fb1e27d93c649c) Thanks [@dhaidashenko](https://github.com/dhaidashenko)! - Fixed CPU usage issues caused by inefficiencies in HeadTracker.
+
+  HeadTracker's support of finality tags caused a drastic increase in the number of tracked blocks on the Arbitrum chain (from 50 to 12,000), which has led to a 30% increase in CPU usage.
+
+  The fix improves the data structure for tracking blocks and makes lookup more efficient. BenchmarkHeadTracker_Backfill shows 40x time reduction.
+  #bugfix
+
+- [#13256](https://github.com/smartcontractkit/chainlink/pull/13256) [`d133da44a9`](https://github.com/smartcontractkit/chainlink/commit/d133da44a9bb0a1393363740cbdc7edc18871b4f) Thanks [@samsondav](https://github.com/samsondav)! - Fix panic if mercury server returns error #bugfix
+
 - [#13151](https://github.com/smartcontractkit/chainlink/pull/13151) [`b3d431c41a`](https://github.com/smartcontractkit/chainlink/commit/b3d431c41ae78a678a9d0c769ec20874785cbcda) Thanks [@jmank88](https://github.com/jmank88)! - core/services: fix ocrWrapper saveError contexts #internal
 
 - [#12907](https://github.com/smartcontractkit/chainlink/pull/12907) [`f0439ec840`](https://github.com/smartcontractkit/chainlink/commit/f0439ec8408b39456a74c37df9a264782ed4725c) Thanks [@ilija42](https://github.com/ilija42)! - Fix in memory data source cache changes/bug that only allowed pipeline results where none of the data sources failed. #bugfix