Arcadie Condrat

panic: duplicate label names

13

Looks like the exporter crashes when a metric has duplicate label names. ``` time="2020-05-04T13:49:10Z" level=info msg="Starting stackdriver_exporter (version=0.7.0, branch=HEAD, revision=a339261e716271d77f6dc73d1998600d6d31089b)" source="stackdriver_exporter.go:136" time="2020-05-04T13:49:10Z" level=info msg="Build context (go=go1.14.2, user=root@6bfda044714a, date=20200501-12:39:15)" source="stackdriver_exporter.go:137" time="2020-05-04T13:49:10Z"...