grafana: add GC trigger size (#18400)
grafana: add GC trigger size (#18400)


ngaut/tidb,pingcap/tidb,pingcap/tidb,XuHuaiyu/tidb,EvilMcJerkface/tidb,c4pt0r/tidb,pingcap/tidb,c4pt0r/tidb,c4pt0r/tidb,XuHuaiyu/tidb,ngaut/tidb,kyle-wang/tidb,kyle-wang/tidb,ngaut/tidb,c4pt0r/tidb,coocood/tidb,coocood/tidb,ngaut/tidb,EvilMcJerkface/tidb,kyle-wang/tidb,pingcap/tidb,ngaut/tidb,kyle-wang/tidb,kyle-wang/tidb,ngaut/tidb,pingcap/tidb,c4pt0r/tidb,c4pt0r/tidb,kyle-wang/tidb,pingcap/tidb