The Pick a revision filter on the errors page now lets you select New errors or filter errors "By Revision" or "By Timeframe". It lists the errors in most recent revisions, or only the errors first seen in the selected deploy or timeframe, so you can see exactly what a deploy broke and at what time.
Open the filter, select New errors, and pick a scope: the most recent revisions, a specific revision, or a timeframe. While New errors is selected, the filter label says so, for example New in revision a1b2c3d.
If you use AppSignal MCP, get_exception_incidents has a matching new_only parameter. Ask your agent which new errors your last deploy introduced, or which errors appeared since a point in time.
Read the errors docs for how each scope counts new errors.
