Update changelog for 2.32.0 release (#5403)

services/horizon/CHANGELOG.md

@@ -3,16 +3,21 @@
 All notable changes to this project will be documented in this
 file. This project adheres to [Semantic Versioning](http://semver.org/).
 
-## Pending
+## 2.32.0
 
 ### Added
 
 - Reingest from pre-computed tx meta on remote cloud storage. ([4911](https://github.com/stellar/go/issues/4911)), ([5374](https://github.com/stellar/go/pull/5374))
   - Configure horizon reingestion to obtain ledger tx meta in pre-computed files from a Google Cloud Storage(GCS) location. 
   - Using this option will no longer require a captive core binary be present and it no longer runs a captive core sub-process, instead obtaining the tx meta from the GCS backend.
   - Horizon supports this new feature with two new parameters `ledgerbackend` and `datastore-config` on the `reingest` command. Refer to [Reingestion README](./internal/ingest/README.md#reingestion).
+- Add metrics for reaping of history lookup tables ([5385](https://github.com/stellar/go/pull/5385)).
+- Add `--reap-lookup-tables` (defaults to true) which will disable reaping of history lookup tables when set to false. ([5366](https://github.com/stellar/go/pull/5366)).
 
 
+### Fixed
+- Fix ingestion duration metric so it includes time spent reaping history lookup tables ([5361](https://github.com/stellar/go/pull/5361)).
+- Optimize query for reaping history lookup tables ([5393](https://github.com/stellar/go/pull/5393)).
 
 ## 2.31.0