Update the changelog for horizon v2.4.0

services/horizon/CHANGELOG.md

@@ -5,19 +5,26 @@ file. This project adheres to [Semantic Versioning](http://semver.org/).
 
 ## Unreleased
 
-### DB Schema change
+## v2.4.0
+
+**Upgrading to this version from <= v2.1.1 will trigger a state rebuild. During this process (which can take up to 20 minutes), Horizon will not ingest new ledgers.**
+
+### DB State Migration
 
 * This release comes with a small DB schema change (new multiplexed-account-related columns are incororated). It should not take more than five minutes to run due to new columns being NULL-able. 
+### Deprecations
+
+* Deprecate `--captive-core-config-append-path` in favor of `--captive-core-config-path`. The difference between the two flags is that `--captive-core-config-path` will validate the configuration file to reject any fields which are not supported by captive core ([3629](https://github.com/stellar/go/pull/3629)).
 
 ### New features 
 
 * Refactor `ingest/ledgerbackend/LedgerBackend.GetLedger` method to always block, removing `ingest/ledgerbackend/LedgerBackend.GetLedgerBlocking`. Adds a first `context.Context` param to most `LedgerBackend` methods.
 
-* Add more in-depth Prometheus metrics (count & duration) for db queries.
+* Add more in-depth Prometheus metrics (count & duration) for db queries. ([#3597](https://github.com/stellar/go/pull/3597), [#3605](https://github.com/stellar/go/pull/3605))
 
-* Fix bug in `horizon db reingest range` command which required the `--ingest` flag to be set ([3625](https://github.com/stellar/go/pull/3625)).
+* HTTP request logs will now print the Origin header if Referer is not set. ([#3599](https://github.com/stellar/go/pull/3599))
 
-* Deprecate `--captive-core-config-append-path` in favor of `--captive-core-config-path`. The difference between the two flags is that `--captive-core-config-path` will validate the configuration file to reject any fields which are not supported by captive core ([3629](https://github.com/stellar/go/pull/3629)).
+* Fix bug in `horizon db reingest range` command which required the `--ingest` flag to be set ([3625](https://github.com/stellar/go/pull/3625)).
 
 * Add Multiplexed Account details to API responses (additional `_muxed` and `_muxed_id` optional fields following what's described in [SEP 23](https://github.com/stellar/stellar-protocol/blob/master/ecosystem/sep-0023.md#horizon-api-changes)):
   * Transactions: `account_muxed`, `account_muxed_id`, `fee_account` and `fee_account_muxed`.