config: Make labels' format constaint consistent with PD (#9745)
config: Make labels' format constaint consistent with PD (#9745)

* config: Make labels' format constaints consistent with PD

Signed-off-by: MyonKeminta <f61fcbf0b1b8e66e29bfd79a313ac22303163882@users.noreply.github.com>

* Address comments

Signed-off-by: MyonKeminta <f61fcbf0b1b8e66e29bfd79a313ac22303163882@users.noreply.github.com>

Co-authored-by: MyonKeminta <f61fcbf0b1b8e66e29bfd79a313ac22303163882@users.noreply.github.com>
Co-authored-by: Ti Chi Robot <72214b26dd6f24c8c411751e1f8e05856122286e@users.noreply.github.com>
BusyJay/tikv,BusyJay/tikv,BusyJay/tikv,BusyJay/tikv,c4pt0r/tikv