Context: open-telemetry/opentelemetry-go#7044

When UTF8Allowed=true,

otlptranslator.Metric{
    Name: "foo.seconds"
    Type: otlptranslator.MetricTypeMonotonicCounter
    Unit: "s"
}

becomes foo.seconds_seconds_total. Expected: foo.seconds_total.

otlptranslator.Metric{
    Name: "foo.total"
    Type: otlptranslator.MetricTypeMonotonicCounter
    Unit: "s"
}

becomes foo.total_seconds_total. Expected: foo_seconds_total.

It looks like we simply append suffixes when UTF8 is allowed:

But we have a more sophisticated strategy for making sure we don't get duplicate suffixes when UFF8 is not allowed: