* change alert rule

* Db connect update (#939)

* update target's cluster field when clustername modified in server.conf

* code refactor

* db connect update

* delete DriverName
Co-authored-by: NUlric Qin <ulric.qin@gmail.com>
Co-authored-by: Nzhangjiandong <zhang.jiandong@baiso.com>

* update sql struct

* change sql

* add some files for new dashboard

* add new board apis

* fix query data

* add dashboard migrate api

* rule note support template

* add value as data for template

* parse rule note before persist

* use prometheus var names

* fixbug rule note template

* refactor sql

* add logo

* refactor: add some log

* mv package poster to pkg

* add version

* compute user total in usage reporter

* feat: add some service api
Co-authored-by: N710leo <710leo@gmail.com>
Co-authored-by: Ncountingwww <871138993@qq.com>
Co-authored-by: Nzhangjiandong <zhang.jiandong@baiso.com>

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* doc: improve readme