opentelemetry v0.4.0

Alpha v4 release.

opentelemetry-api

• Separate Default classes from interface descriptions (#311)
• Added named Tracers (#301)
• Add int and valid sequenced to AttributeValue type (#368)
• Add ABC for Metric (#391)
• Metric classes required for export pipeline (#341)
• Adding Context API Implementation (#395)
• Remove monotonic and absolute metric instruments (#410)
• Adding trace.get_tracer function (#430)

opentelemetry-sdk

• Added named Tracers (#301)
• Set status for ended spans (#297 and #358)
• Use module loggers (#351)
• Protect start_time and end_time from being set manually by the user (#363)
• Add runtime validation for set_attribute (#348)
• Add support for B3 ParentSpanID (#286)
• Set status in start_as_current_span (#377)
• Implement force_flush for span processors (#389)
• Metrics export pipeline, and stdout exporter (#341)
• Set sampled flag on sampling trace (#407)
• Add io and formatter options to console exporter (#412)
• Clean up ProbabilitySample for 64 bit trace IDs (#238)
• Adding Context API Implementation (#395)
• Remove monotonic and absolute metric instruments (#410)
• Implement MinMaxSumCount aggregator (#422)

opentelemetry-ext-dbapi

• Initial release

opentelemetry-ext-flask

• Use string keys for WSGI environ values (#366)

opentelemetry-ext-jaeger

• Export span status (#367)
• Export span kind (#387)

opentelemetry-ext-mysql

• Initial release

opentelemetry-ext-prometheus

• Initial release

opentelemetry-ext-psycopg2

• Initial release

opentelemetry-ext-pymongo

• Updating network connection attribute names (#350)

opentelemetry-ext-wsgi

• Updating network connection attribute names (#350)

opentelemetry-ext-zipkin

• Initial release