recently I'm trying to drop some metrics since prometheus usage is getting
way too much than I expected.
```
metric_relabel_configs:
- source_labels: [__name__]
separator: ;
regex: (istio_requests_total)
replacement: $1
action: drop
```
But I tried this fairly straight forward metric_relabel_configs,
"istio_requests_total" doesn't drop as expected. I know you may ask why I
don't drop this in relabeling.
My very first goal is to drop all the metrics with destination_service =
unknown associated with istio like :
```
- source_labels: [destination_service]
separator: ;
regex: ^unknown(.*)
replacement: $1
action: drop
```
This doens't work ,so I go back to a simple "metric" drop see if this can
work. Anyways let me know if I made anything wrong and thank you all in
advance !
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