* init

* audit: init first version of audit log

* audit: support log global rotate

* audit: update log keys

* audit: more common notify implement

* audit: add record id

* audit: rename some names

* audit: default use normal log path

* audit: add server ip info

* audit: do some refine

* audit: Add some log keys

* audit: update some item format

* audit: add stmt demo

* audit: support redact

* audit: fix bug

* audit: update filter

* audit: update filter

* audit: check user

* audit: update

* update

* audit: update

* audit: fix bug

* aduit: update

* audit: update

* update

* update

* audit: add filter unit test

* fmt

* Add tests for `tidb_audit_enabled` and `tidb_audit_log`

* Add tests for `tidb_audit_log_max_size` and `tidb_audit_log_max_lifetime`

* Add tests for `tidb_audit_log_reserved_*`

* TODO: TestAuditLogRedact

* Fininsh `TestAuditLogRedact`

* Update (pingcap#1)

* fix typo (pingcap#2)

* Add `TRANSACTION`

* rename sysvar

* audit_log_create_filter, audit_log_remove_filter

* finish function call and table test

* test privilege

* finish test for sysvar

* TODO: TestConnectionEvenClass

* update

* audit: fix lint for audit log (pingcap#1)

* audit: fix UT failure caused by the change of redact log (pingcap#3)

* audit: use `t.TempDir()` to make test stable (pingcap#4)

* audit: fix test failed for 7.1

* Add `OWNERS` file (pingcap#35)

Co-authored-by: Chao Wang <cclcwangchao@hotmail.com>

* audit: fix panic when logging sometime (pingcap#26) (pingcap#31)

* test: fix unstable test TestAuditLogReservedDays (pingcap#8)

* Format sysvar_test.go

* audit: use `StatementContext` to generate redacted SQL (pingcap#9)

* audit: fix panic when logging sometime (pingcap#26)

* update

* add owner

* Update OWNERS

---------

Co-authored-by: CbcWestwolf <1004626265@qq.com>
Co-authored-by: wuhuizuo <wuhuizuo@126.com>

* audit: fix panic sometimes when `create user` without password (pingcap#37) (pingcap#39)

* This is an automated cherry-pick of pingcap#37

Signed-off-by: ti-chi-bot <ti-community-prow-bot@tidb.io>

* fix conflict

---------

Signed-off-by: ti-chi-bot <ti-community-prow-bot@tidb.io>
Co-authored-by: 王超 <cclcwangchao@hotmail.com>

* extension/audit: introduce serverless audit log

Signed-off-by: Wen Jiazhi <jiazhi.wen@pingcap.com>

* update bazel config

Signed-off-by: Wen Jiazhi <jiazhi.wen@pingcap.com>

* support enable audit log when activate

Signed-off-by: Wen Jiazhi <jiazhi.wen@pingcap.com>

* add gwconnid to audit log

Signed-off-by: Wen Jiazhi <jiazhi.wen@pingcap.com>

* comment unstable test

* update bazel

* add log about activate request

* diff audit log enabled

* audit: fix memory leak for executeSQL (pingcap#44) (pingcap#45)

* This is an automated cherry-pick of pingcap#44

Signed-off-by: ti-chi-bot <ti-community-prow-bot@tidb.io>

* Update util.go

---------

Signed-off-by: ti-chi-bot <ti-community-prow-bot@tidb.io>
Co-authored-by: 王超 <cclcwangchao@hotmail.com>

* Update extension/serverless/OWNERS

---------

Signed-off-by: ti-chi-bot <ti-community-prow-bot@tidb.io>
Signed-off-by: Wen Jiazhi <jiazhi.wen@pingcap.com>
Co-authored-by: Chao Wang <cclcwangchao@hotmail.com>
Co-authored-by: cbcwestwolf <1004626265@qq.com>
Co-authored-by: Ti Chi Robot <ti-community-prow-bot@tidb.io>
Co-authored-by: wuhuizuo <wuhuizuo@126.com>
Co-authored-by: zzm <zhouzemin@pingcap.com>
Co-authored-by: Yuqing Bai <baiyuq@gmail.com>