Update metrics that missed labels

[opan]

Update for PR #857

[coveralls]

Pull Request Test Coverage Report for Build 255

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.1%) to 91.963%

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Totals
Change from base Build 247:	-0.1%
Covered Lines:	1968
Relevant Lines:	2140

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💛 - Coveralls

[opan]

This update is required. Without the labels, the metrics won't show up in /metrics. I have tested this locally. I will try to add some tests for this.

[oliver006]

Thanks.
PR looks good but this time let's add tests to make sure the metrics really get recorded.

[opan]

I have try to add the test in here.

If this does not suffice, I will try to add more test regarding this.

[oliver006]

Ok, thanks, let me have another look.

[oliver006]

PR looks good - just one Q about the docker-compose changes.