support regular expression in the metricslabel

[guoshouyan]

Feature Request

Hi team, I'm using diag to detch lightning metrics and upload to clinic. Our lighting are running on different namespace, for example, lightning-usa, lightning -usb, lightning-usc.

In our grafana metrics we can filter them by adding the filter of namespace=~"lightning-us.*". But I can not do that with diag util metricdump --metricslabel "namespace=~lightning-us.*"

Currently I have to run the diag 3 times, each time only upload one namespace metrics

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