This release contains a Metrics SDK with stdout exporter and supports basic aggregations such as counter, gauges, array, maxsumcount, and ddsketch.

Added

• Metrics stdout export pipeline. (#265)
• Array aggregation for raw measure metrics. (#282)
• The core.Value now have a MarshalJSON method. (#281)

Removed

• WithService, WithResources, and WithComponent methods of tracers. (#314)
• Prefix slash in Tracer.Start() for the Jaeger example. (#292)

Changed

• Allocation in LabelSet construction to reduce GC overhead. (#318)
• trace.WithAttributes to append values instead of replacing (#315)
• Use a formula for tolerance in sampling tests. (#298)
• Move export types into trace and metric-specific sub-directories. (#289)
• SpanKind back to being based on an int type. (#288)

Fixed

• URL to OpenTelemetry website in README. (#323)
• Name of othttp default tracer. (#321)
• ExportSpans for the stackdriver exporter now handles nil context. (#294)
• CI modules cache to correctly restore/save from/to the cache. (#316)
• Fix metric SDK race condition between LoadOrStore and the assignment rec.recorder = i.meter.exporter.AggregatorFor(rec). (#293)
• README now reflects the new code structure introduced with these changes. (#291)
• Make the basic example work. (#279)

Changes since v0.1.0

90ba74e Fix url to website in readme (#323)
9878f3b Metrics stdout export pipeline (#265)
c3d5b7b remove empty package (#322)
64eaee8 fix typo in othttp handler (#321)
ee87858 Avoid one memory allocation in LabelSet construction (#318)
9d19d82 Clear NoopTracer implementation and improve Tracer argument names (#314)
1fd93b2 change trace.WithAttributes to append values instead of replacing (#315)
a228baf exporter(stackdriver): fix ExportSpans when ctx is not nil (#294)
f403198 propose additional CODEOWNERS (#313)
b6ada23 Fix CI modules cache (#316)
2950978 Remove myself from CODEOWNERS (#308)
769a03a Use a formula for tolerance in sampling tests (#298)
2546646 Fix metric SDK race condition (#293)
68bd627 Move export types into trace and metric-specific subdirs (#289)
17439d8 [example/jaeger] Remove prefix slash in Tracer.Start() (#292)
2ac5725 update README for v0.1.0 (#291)
1bfa1aa Change SpanKind type an integer type (#288)
9040d82 Add array aggregation for raw measure metrics, improve testing (#282)
6b48fce example/basic: make basic example work (#279)
881e51f Add MarshalJSON for core.Value (#281)