Added

• js_PauseConsumer support (also changed jsConsumerConfig, jsCo… by @levb in #726
• Expose MaxPendingBytes on the natsOptions by @LaurensVergote in #700
• kvStore_WatchMulti, js_Subscribe[Sync]Multi by @levb in #750
• natsConnection_Reconnect by @levb in #757
• Support %-encoded username/password in server URLs by @levb in #765
• Support linking with MinGW toolchains on Linux by @XJ-0461 in #763
• TLS: natsOptions_TLSHandshakeFirst() by @kozlovic in #780
• Adding SNI extension if available by @thierryba in #787
• Add filtering to KV method returning all keys by @saurabhojha in #797
• js_PullSubscribeAsync by @levb in #785
• [BREAKING] Services: queue group now configurable and can be disabled by @levb in #800
• nats_GetJWTOrSeed to understand Windows \r\n lines by @levb in #801

Fixed

• Moved micro_args to examples by @levb in #731
• Modify JetStream examples (Add comments to SubjectsLen) by @pch-blog in #734
• Build: issue on Android with NATS_EXTRA_LIB by @kozlovic in #739
• GH-738, do not prefix endpoint name with the group prefix by @levb in #741
• GH-736: added extern to micro_Errors by @levb in #743
• Fix heap buffer overflow in _fetch by @tyler92 in #749
• Improve Windows build support by @mtmk in #760
• refactored nats.c, prep for js_PullSubscribeAsync by @levb in #778
• Fixing setting handshake_first without setting secure in the natsOptions by @thierryba in #789

Non-code changes

• [ADDED] GitHub action to update docs by @levb in #720
• [FIXED] doxygen GH action skip ci, include release_* by @levb in #725
• [FIXED] More fixes for doxygen autoupdate by @levb in #729
• [FIXED] flapping test: Test_KeyValueMirrorCrossDomains by @levb in #747
• [ADDED] Build with GitHub actions by @levb in #748
• [CI only]: Nightly test server main, latest release by @levb in #751
• [TEST only] increased Test_KeyValueMirrorCrossDomains timeout value by @levb in #753
• [CI only] Adjusted coverage targets/thresholds by @levb in #752
• [CI only] run tests once, not x3 except for main, release by @levb in #759
• [TEST ONLY] Fixed Test_JetStreamSubscribeIdleHeartbeat by @levb in #764
• [CI only] Skip codecov for forks until they resolve tokenless uploads… by @levb in #768
• [FIXED] cleaning up sanitize=thread found several races by @levb in #771
• benchmark for SubscribeAsync by @levb in #774
• Fixed test_JetStreamInfoAlternates flapper by @kozlovic in #775
• [CHANGED] sub benchmark tuned by @levb in #777
• Fixed flappers and test_SSLHandshakeFirst by skipping if server is < 2.10.0 by @kozlovic in #784
• Fixed test SSLVerifyHostName when build NATS_FORCE_HOST_VERIFICATION=OFF by @kozlovic in #788
• nats.c is available on conan.io/center by @mathi-m in #791
• [TEST ONLY] test fixes for 2.11 server changes by @levb in #798

New Contributors

• @github-actions made their first contribution in #732
• @pch-blog made their first contribution in #734
• @LaurensVergote made their first contribution in #700
• @mtmk made their first contribution in #760
• @XJ-0461 made their first contribution in #763
• @thierryba made their first contribution in #787
• @mathi-m made their first contribution in #791
• @saurabhojha made their first contribution in #797

Full Changelog: v3.8.0...v3.9.0