### Added
- PHP 8.4 support #2758
- Support Tag Keys for DD_TRACE_HEADER_TAGS #2922
- Add stubs for the Public PHP API #2933
- These are available as datadog_tracer.stubs.php release asset
- Collect agent info and apply the env for remote config #2930
### Changed
- Increase read timeout of sidecar for synchronous flushes #2910
- Implement Universal Service Tracking Consistency #2896
- Updating Default Rate Limit Value and Usage Based on Sample Rate #2912
### Fixed
- Fix a possible crash in zai config #2906
- Fix crash when yielding from generators are destroyed #2908
- Fix bad hasThis() check on PHP 7.0 #2911
- Fix RootSpanData writer interception on consecutive calls #2919
- Fix DD_TRACE_OBFUSCATION_QUERY_STRING_REGEXP Empty Value Behavior #2909
- Handle hooks on trampoline fake closures #2925
- Fix crash with locals collection in generator close sequence #2932
- Avoid the hook frame in mysqli connection error tracking #2937
- Support multiple PHP_INI_SCAN_DIR's #2941
- Fix use-after-free in exception replay #2947
- Fully disable the sidecar on lambda by setting all related configs to false #2948
- Fix Symfony Messenger propagation to non-instrumented clients #2956
- Fix JIT crash: There may or may not be a readable ZEND_TRACE_OP_INFO() #2942
- Block remote config signals during ftp functions #2957
- Deduplicate Debugger diagnostics in sidecar Datadog/libdatadog#736
- Handle case where the applictaion is stopped without other telemetry sent Datadog/libdatadog#743
### Internal
- Create many tiny artifacts for faster download #2951
- Using datadog-setup.php will now download less than 50 MB for a single PHP version
- Add names to memfds Datadog/libdatadog#714
- Allow attaching to the sidecar via gdb Datadog/libdatadog#687
### SSI Loader changes
- Fix compatilibity with PHP 5 #2939
- Fix crash when the loader is loaded multiple times #2954
## Profiling
### Added
- Add fatals and thread start/end events to timeline #2820
- Add thread names #2934
- Add timeline active check for fatals #2945
- Add stream_select()-type functions to timeline #2943
- Visualise opcache restarts in the timeline #2946
## Application Security Management
### Changed
- Disable helper when appsec is fully disabled #2935