Add support for createservicetimeseries to the SDK metrics exporter

[dashpole]

Similar to the collector exporter, add config that enables CSTS:

opentelemetry-operations-go/exporter/collector/config.go

Lines 122 to 124 in 5476951

	// CreateServiceTimeSeries, if true, this will send all timeseries using `CreateServiceTimeSeries`.
	// Implicitly, this sets `SkipMetricDescriptor` to true.
	CreateServiceTimeSeries bool `mapstructure:"create_service_timeseries"`

(handle compression, if applicable)

opentelemetry-operations-go/exporter/collector/metrics.go

Lines 236 to 237 in 5476951

	client.CallOptions.CreateServiceTimeSeries = append(client.CallOptions.CreateServiceTimeSeries,
	gax.WithGRPCOptions(grpc.UseCompressor(gzip.Name)))

Skip creating metric descriptors if set

opentelemetry-operations-go/exporter/collector/metrics.go

Lines 350 to 353 in 5476951

	// We only send metric descriptors if we're configured *and* we're not sending service timeseries.
	if me.cfg.MetricConfig.SkipCreateMetricDescriptor || me.cfg.MetricConfig.CreateServiceTimeSeries {
	continue
	}

Use this instead of CreateTimeSeries if set

opentelemetry-operations-go/exporter/collector/metrics.go

Lines 425 to 429 in 5476951

	if me.cfg.MetricConfig.CreateServiceTimeSeries {
	err = me.createServiceTimeSeries(ctx, req)
	} else {
	err = me.createTimeSeries(ctx, req)
	}

[frankyn]

Hi @dashpole is there someone that help pick up this request on your team?

[psx95]

Hi @frankyn, I am picking this up.