*: adjust delta schema count and add metrics (#11625)#12502

Merged

jackysp merged 1 commit intopingcap:release-3.0from zimulala:schema-cache-3.0

Oct 8, 2019

+189-7

Commits on Sep 30, 2019

*: adjust delta schema count and add metrics (pingcap#11625 )
zimulala
committed