metrics: fix a expression error of unified read pool cpu
close tikv/tikv#13086
"steppedLine": false,
"targets": [
{
- "expr": "sum(rate(tikv_thread_cpu_seconds_total{k8s_cluster=\"$k8s_cluster\", tidb_cluster=\"$tidb_cluster\", instance=~\"$instance\", name=~\"unified_read_po*\"}[1m])) by (instance)",
+ "expr": "sum(rate(tikv_thread_cpu_seconds_total{k8s_cluster=\"$k8s_cluster\", tidb_cluster=\"$tidb_cluster\", instance=~\"$instance\", name=~\"unified_read_po.*\"}[1m])) by (instance)",
"format": "time_series",
"interval": "",
"intervalFactor": 2,
