[OWL-475] update func getMetricsByMetricType()
[OWL-475] update func getMetricsByMetricType()

Cepave/open-falcon-backend,Cepave/query,masato25/open-falcon-backend,masato25/query,Cepave/open-falcon-backend,masato25/open-falcon-backend,masato25/open-falcon-backend,masato25/open-falcon-backend,Cepave/query,Cepave/query,masato25/query,Cepave/open-falcon-backend,Cepave/open-falcon-backend,masato25/open-falcon-backend,masato25/query,Cepave/open-falcon-backend,masato25/open-falcon-backend,Cepave/query,masato25/query,Cepave/open-falcon-backend