docs: gateway release 16 change log

docs/src/gateways/ar-io-node/release-notes.md

@@ -8,6 +8,29 @@ next: false
 
 Welcome to the documentation page for the ar.io gateway release notes. Here, you will find detailed information about each version of the ar.io gateway, including the enhancements, bug fixes, and any other changes introduced in every release. This page serves as a comprehensive resource to keep you informed about the latest developments and updates in the ar.io gateway. For those interested in exploring the source code, each release's code is readily accessible at our GitHub repository: ar.io gateway [change logs](https://github.com/ar-io/ar-io-node/blob/main/CHANGELOG.md). Stay updated with the continuous improvements and advancements in the ar.io gateway by referring to this page for all release-related information.
 
+## [Release 16] - 2024-08-09
+
+- **Fixed**
+
+  - Fixed promise leak caused by missing await when saving data items to the DB.
+  - Modified ArNS middleware to not attempt resolution when receiving requests for a different hostname than the one specified by `ARNS_ROOT_HOST`.
+
+- **Added**
+
+  - Added support for returning `Content-Encoding` HTTP headers based on user specified Content-Encoding tags.
+  - Added `isNestedBundle` filter enables that matches any nested bundle when indexing. This enables composite unbundling filters that match a set of L1 tags and bundles nested under them.
+  - Added ability to skip writing ANS-104 signatures to the DB and load them based on offsets from the data instead. This significantly reduces the size of the bundles DB. It can be enabled by setting the `WRITE_ANS104_DATA_ITEM_DB_SIGNATURES` environment variable to false.
+  - Added `data_item_data_indexed_total` Prometheus counter to count data items with data attributes indexed.
+
+- **Changed**
+
+  - Queue data attributes writes when serving data rather than writing them syncronously.
+  - Reduced the default data indexer count to 1 to lessen the load on the data DB.
+  - Switched a number of overly verbose info logs to debug level.
+  - Removed docker-compose on-failure restart limits to ensure that services restart no matter how many times they fail.
+  - Modified the `data_items_indexed_total` Prometheus counter to count data items indexed for GraphQL querying instead of data attributes.
+  - Increased aggressiveness of contiguous data cleanup. It now pauses 5 seconds instead of 10 seconds per batch and runs every 4 hours instead of every 24 hours.
+
 ## [Release 15] - 2024-07-19
 
 - **Fixed**