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The MetricGroup interface contains methods to create groups and metrics using an int as a name. The original intention was to allow pattern like group.addGroup("subtaskIndex").addGroup(0) , but this didn't really work out, awith with addGroup(String, String)  serving this use-case much better.

Metric methods accept an int mostly for consistency, but there's no good use-case for it.

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MetricGroup methods:

• #counter(int[, Counter])
• #meter(int, Meter)
• #gauge(int, Gauge)
• #histogram(int, Histogram)
• #group#addGroup(int)

Proposed Changes

Remove the methods without a replacement.

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