metrics: add txn ttl lifetime (#766)

Signed-off-by: Jack Yu <jackysp@gmail.com>
Co-authored-by: Shirly <AndreMouche@126.com>

region_request: handle resource group error before Backoff (#719)

Signed-off-by: Cabinfever_B <cabinfeveroier@gmail.com>
Co-authored-by: disksing <i@disksing.com>

config support both path and names (#683)

Signed-off-by: HuSharp <jinhao.hu@pingcap.com>

fix data race in the LockKeys (#655)

Signed-off-by: Weizhen Wang <wangweizhen@pingcap.com>

don't call onMemChange before all work is done in memdb (#636)

Signed-off-by: ekexium <eke@fastmail.com>

upgrade tidb in integration test (#614)

Signed-off-by: YangKeao <yangkeao@chunibyo.icu>

client: fix the race between connArray.Close() and connArray.Get() (#466

)

Signed-off-by: disksing <i@disksing.com>

txnkv: fix the issue that deleteRange cannot use nil as endkey (#429)

Signed-off-by: disksing <i@disksing.com>

txnkv: decrease some max and base backoff time (#388)


Signed-off-by: youjiali1995 <zlwgx1023@gmail.com>

branch name related changes (#146)

Signed-off-by: disksing <i@disksing.com>