Specify a low-memory temporality preference for the OTLP metrics exporter#2961
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Fixes #2738
Changes
Adds a low-memory aggregation temporality preference configuration for the OTLP metrics exporter, "lowmemory" which configures the OTLP exporter to use delta temporality for synchronous Counter and Histogram instruments.
Related issue: #1891
Note that a parallel change #2960 specifies limits and states that SDKs SHOULD remove timeseries from memory when they are stale and Delta aggregation temporality is configured, which they will be able to do in conjunction with the "lowmemory" preference here.
Note that this could benefit users even when metrics data is collected by Prometheus servers. The OTel Collector's
prometheusexportersupports delta-to-cumulative translation, making it possible with a "lowmemory" OTLP exporter configuration to shift the memory requirement for cumulative timeseries calculation from the client to a collector.