diagnostics: refine the load information of memory (#6535)
diagnostics: refine the load information of memory (#6535)

Signed-off-by: Lonng <8ed72e0d00108201f79dd2bb5270f106b3e5c19c@lonng.org>
BusyJay/tikv,c4pt0r/tikv,pingcap/tikv,pingcap/tikv,BusyJay/tikv,BusyJay/tikv,BusyJay/tikv