.travis.yml configuration schema transition and build matrix log aggregation

Updating a legacy .travis.yml file to the current schema involves restructuring how build matrices are defined and how environment variables are passed to parallel jobs. While the current API specifications improve pipeline flexibility, the transition affects how build logs are sequenced and aggregated during failures.

When executing a complex matrix build, a failure in a single environment combination triggers a non-zero exit code, but the resulting log output can be fragmented across multiple parallel jobs. This makes it difficult to isolate whether a failure stems from a specific schema-defined environment variable or a systemic script error.

What is the documented behavior for aggregating logs across a matrix build when transitioning to the latest configuration schema? Does the current schema provide a mechanism to consolidate failure markers from parallel jobs into a single diagnostic view?