improve summary metrics converting.

[h0cheung]

Component(s)

processor/transform

Is your feature request related to a problem? Please describe.

There are functions like convert_summary_count_val_to_sum and convert_summary_sum_val_to_sum, which can convert values in summary to sum and count.
However, the have some limitions:

• the suffix added is always _sum or _count. But according to OpenTelemetry's convention, . should be used instead of _ in this case.
• Support for quantile is missing.

Describe the solution you'd like

1. Update function specification: convert_summary_count_val_to_sum(aggregation_temporality, is_monotonic, Optional[suffix]). The new optional parameters allow setting the suffix to add. By default, suffix is ".sum".
2. New function: converter_summary_quantile_val_to_gauge(Optional[suffix]). The suffix defaults to ".quantile_%s", where %s will be replaced with the quantile value and the decimal point will be removed. For example, ".quantile_99", ".quantile_999" will be added.

Describe alternatives you've considered

Use a single function or component to convert summary to two sums and a gauge.

Additional context

No response

[github-actions]

Pinging code owners:

• processor/transform: @TylerHelmuth @kentquirk @bogdandrutu @evan-bradley

See Adding Labels via Comments if you do not have permissions to add labels yourself.

[github-actions]

This issue has been inactive for 60 days. It will be closed in 60 days if there is no activity. To ping code owners by adding a component label, see Adding Labels via Comments, or if you are unsure of which component this issue relates to, please ping @open-telemetry/collector-contrib-triagers. If this issue is still relevant, please ping the code owners or leave a comment explaining why it is still relevant. Otherwise, please close it.

Pinging code owners:

• processor/transform: @TylerHelmuth @kentquirk @bogdandrutu @evan-bradley

See Adding Labels via Comments if you do not have permissions to add labels yourself.

[TylerHelmuth]

As a workaround for now, a second statement can be written to change the metric name