metrics: fix compaction pending bytes metrics in tikv details
"steppedLine": false,
"targets": [
{
- "expr": "tikv_engine_pending_compaction_bytes{instance=~\"$instance\", db=\"$db\"}",
+ "expr": "sum(tikv_engine_pending_compaction_bytes{instance=~\"$instance\", db=\"$db\"}) by (cf)",
"format": "time_series",
"hide": false,
"intervalFactor": 2,
