Release v1.4.0

v1.4.0 (2021-06-07)

Context

• No changes.

Traces

• Add schema_url support to Tracer. (#1666)
• Add Dropped Links Count to non-otlp exporters section (#1697)
• Add note about reporting dropped counts for attributes, events, links. (#1699)

Metrics

• Add schema_url support to Meter. (#1666)
• Adds detail about when to use StartTimeUnixNano and handling of unknown start-time resets. (#1646)
• Expand Gauge metric description in the data model (#1661)
• Expand Histogram metric description in the data model (#1664)
• Added Experimental Metrics API specification.
  (#1401,
  #1557,
  #1578,
  #1590,
  #1594,
  #1617,
  #1645,
  #1657,
  #1665,
  #1672,
  #1674,
  #1675,
  #1703,
  #1704,
  #1731,
  #1733)
• Mark relevant portions of Metrics Data Model stable (#1728)

Logs

• No changes.

Resource

• Add schema_url support to Resource. (#1692)
• Clarify result of Resource merging and ResourceDetector aggregation in case of error. (#1726)

Semantic Conventions

• Add JSON RPC specific conventions (#1643).
• Add Memcached to Database specific conventions (#1689).
• Add semantic convention attributes for the host device and added OS name and version (#1596).
• Add CockroachDB to Database specific conventions (#1725).

Compatibility

• No changes.

OpenTelemetry Protocol

• No changes.

SDK Configuration

• Add OTEL_SERVICE_NAME environment variable. (#1677)