DataDog/dd-trace-php 1.19.0 on GitHub

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Fix critical ZTS race condition in INI value refcounting that caused use-after-free crashes under concurrent load #3832
Ensure a unique installation directory to avoid conflicts with other tools #3835

Implement client-side stats computation using shared memory for zero-copy stats delivery, with fallback to socket on first payloads #3756, #3811, #3815, #3836

Use a webserver-wide session ID for sidecar instead of per-fork session IDs, and propagate it to child processes via environment #3828, #3838

Fix ZTS race condition in process_tags.serialized refcounting on shared inter-thread string #3831
Fix dynamic instrumentation installation regression when enabling via dynamic config #3843
Handle APM_MULTI_CONFIG remote configuration and fix missing data for exception replay #3791
Fix duration of httpstream and live debugger spans being incorrectly reported as zero #3821
Fix instanceof type aliases for PHP 7.x in live debugger DSL (integer/double vs int/float) #3813
Obfuscate :name placeholder parameters in PDO queries for correct DBM correlation #3801
Fix locale settings breaking ksr resolution #3797 (thank you @jdmaguire for the report!)
Fix exception in PDO::__construct when signals arrive during database connection setup #3841
Fix infinite loop in crashtracker runtime stack collection #3845
Fix Request::get() removal in Symfony 8 #3809 - thanks for the fix @TomBrouws!

Add timeout to sidecar info fetcher DataDog/libdatadog#1890
Allow sidecar worker to be stopped cleanly after fork DataDog/libdatadog#1893
Use a dedicated sidecar connection per PHP thread, reducing lock contention and enabling per-thread request queuing #3770
Emit environment variable names in telemetry config (e.g., DD_TRACE_GENERATE_ROOT_SPAN) instead of INI dot notation #3783
Default crash report upload to errors intake to be enabled DataDog/libdatadog#1902
Flush telemetry on anticipated sidecar shutdown to avoid data loss for short-lived sidecars #3806
Skip sending empty telemetry payloads DataDog/libdatadog#1894
Wire telemetry extended heartbeat interval through sidecar SessionConfig DataDog/libdatadog#1882, #3800

Fix Remote Config regression in Rust helper #3840
Fix double-logging of broken connections as errors and improve connection error handling in Rust helper #3792, #3803