ddl_sink (ticdc): fix ddl sink nil point panic (pingcap#6390) (pingca…

…p#6431)

close pingcap#4934

redo(ticdc): handle error correctly in redo manager (pingcap#6366) (p…

…ingcap#6386)

close pingcap#6368

tests(ticdc): use python3 to run http_api test to fix failed integrat…

…ion_test (pingcap#6424)

ref pingcap#5474

kv(cdc): set enableOldValue correctly (pingcap#6410)

ref pingcap#5610

puller(ticdc): hotfix for 5.4.1- reduce context switch for stateful e…

…vents (pingcap#6385)

close pingcap#5610

redo(ticdc): Optimize redolog I/O performance (pingcap#6262) (pingcap…

…#6337)

close pingcap#5920

server (ticdc): add timeout for statusServer. (pingcap#5332) (pingcap…

…#5346)

close pingcap#5303

Cdc add duration log (pingcap#6035)

close pingcap#6033

owner(ticdc): Add support for region-label to enable meta-region isol…

…ation (pingcap#4937) (pingcap#5353)

close pingcap#4756, close pingcap#4762

kv(ticdc): fix data loss when upstream txn conflicts during scan (pin…

…gcap#5477) (pingcap#5829)

close pingcap#5468