1.17.1

:bug: (Bug Fix)

• fix(sdk-trace-base): BatchSpanProcessor flushes when maxExportBatchSize is reached #3958 @nordfjord
• fix(sdk-metrics): allow instrument names to contain '/' #4155
• fix(sdk-metrics): prevent per-reader storages from keeping unreported accumulations in memory #4163 @pichlermarc
  • fixes a memory leak which occurred when two or more MetricReader instances are registered to a MeterProvider
• fix(sdk-metrics): do not report empty scopes and metrics #4135 @pichlermarc
  • Instruments that were created, but did not have measurements will not be exported anymore
  • Meters (Scopes) that were created, but did not have any instruments with measurements under them will not be exported anymore.
• fix(exporter-zipkin): round duration to the nearest int in annotations to be compliant with zipkin protocol #4167 @FelipeEmerim

:books: (Refine Doc)

• docs(contributing): added guidelines for adding benchmark tests #4169

:house: (Internal)

• test: added a performance benchmark test for span creation #4105
• test: added a workflow to run performance benchmark tests automatically #4144