Metric.Values - join_by statement

[leppott]

Describe the bug
Update metric.values to avoind join_by statement.

To Reproduce
use metric.values and get the following output to the console

Joining with by = join_by(SAMPLEID, INDEX_NAME, INDEX_CLASS)

Expected behavior
A clear and concise description of what you expected to happen.

Screenshots
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Desktop (please complete the following information):

• OS: [e.g. iOS]
• Browser [e.g. chrome, safari]
• Version [e.g. 22]

Smartphone (please complete the following information):

• Device: [e.g. iPhone6]
• OS: [e.g. iOS8.1]
• Browser [e.g. stock browser, safari]
• Version [e.g. 22]

Additional context
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