October 2, 2017
The Trace viewer now shows parent-child relationships between trace spans. You can expand or collapse the parent spans. See Viewing Trace Details for more information.
August 1, 2017
The Trace Viewer now allows you to view associated log entries in line with trace spans and links to VM logs for Google Cloud Load Balancer spans. See the Log Entries section of Viewing Trace Details.
June 5, 2017
Advanced trace filters: The Trace List page and Trace API now allow filtering traces by custom labels, latencies, child spans, and methods in addition to URIs. See Trace Filters.
February 6, 2017
Zipkin tracer compatibility: Stackdriver Trace is now compatible with Zipkin tracers. For more information, see the blog post.
Scatter plots: We've added a new scatter-plot selection tool to the Stackdriver Trace UI. This lets you more quickly identify, view, and compare interesting traces.
October 20, 2016
Analysis Reports Compare your application's latency profile across time and versions.