* #1240 Update license declaration of each files
Signed-off-by: Njinhai <hai.jin@zilliz.com>

* #1240 Update CHANGELOG
Signed-off-by: Njinhai <hai.jin@zilliz.com>

* Optimize config test. Dir src/config 99% lines covered

* add unittest coverage

* optimize cache&config unittest

* code format

* format

* format code

* fix merge conflict

* cover src/utils unittest

*  '#831 fix exe_path judge error'

* #831 fix exe_path judge error

* add some unittest coverage

* add some unittest coverage

* improve coverage of src/wrapper

* improve src/wrapper coverage

* *test optimize db/meta unittest

* fix bug

* *test optimize mysqlMetaImpl unittest

* *style: format code

* import server& scheduler unittest coverage

* handover next work

* *test: add some test_meta test case

* *format code

* *fix: fix typo

* feat(codecov): improve code coverage for src/db(#872)

* feat(codecov): improve code coverage for src/db/engine(#872)

* feat(codecov): improve code coverage(#872)

* fix config unittest bug

* feat(codecov): improve code coverage core/db/engine(#872)

* feat(codecov): improve code coverage core/knowhere

* feat(codecov): improve code coverage core/knowhere

* feat(codecov): improve code coverage

* feat(codecov): fix cpu test some error

* feat(codecov): improve code coverage

* feat(codecov): rename some fiu

* fix(db/meta): fix switch/case default action

* feat(codecov): improve code coverage(#872)
* fix error caused by merge code
* format code

* feat(codecov): improve code coverage & format code(#872)

* feat(codecov): fix test error(#872)

* feat(codecov): fix unittest test_mem(#872)

* feat(codecov): fix unittest(#872)

* feat(codecov): fix unittest for resource manager(#872)

* feat(codecov): code format (#872)

* feat(codecov): trigger ci(#872)

* fix(RequestScheduler): remove a wrong sleep statement

* test(test_rpc): fix rpc test

* Fix format issue

* Remove unused comments

* Fix unit test error
Co-authored-by: NABNER-1 <ABNER-1@users.noreply.github.com>
Co-authored-by: NJin Hai <hai.jin@zilliz.com>

* refactor code and add error log

* remove the space

* refactor

* refactor

* *fix mysqlMetaImpl Initialize failed create directory

* *style: format code

* *style: format code

* *style: format code

* *style: format code

* *fix: sqliteMetaImpl Initialize failed create directory

* add empty line to trigger CI

* #670 Random failure of unittest db_test::SEARCH_TEST

* add an important log

* add an important log

* add an important log

* #674 server down in stability test

* add more log

* remove log

* #696 metric_type changed from IP to L2

* #696 metric_type changed from IP to L2

* #696 metric_type changed from IP to L2

* #670 Random failure of unittest db_test::SEARCH_TEST

* add an important log

* add an important log

* add an important log

* #674 server down in stability test

* add more log

* remove log

* #696 metric_type changed from IP to L2

#561 Milvus server should report exception/error message or terminate on mysql metadata backend error

Former-commit-id: 052c197f7678f5828580487fb98ab978659c59bf