Add missing case to prometheus helper test (#389) #962

Job	Run time
Unit test code	18s
Lint scripts	3s
Lint code	27s
Verify that Helm README is up to date	13s
Lint Helm chart	3s
Test integration with Prometheus	2m 6s
Verify templating chart with default values	5s
Verify that Makefile section of README is up to date	4s
Build Linux binary	25s
Build Windows binary	0s
Build Mac binary	0s
Build Linux ARM binary	0s
Build Linux Docker image	28s
Build Linux ARM Docker image	0s
Test integration with Helm chart	2m 44s
Create GitHub release	0s
upload-binaries	0s
	6m 56s

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