In September 2025, delivered the DNS Wildcard Alias Matching feature for localstack/localstack, enabling wildcard support for DNS aliases through Resolver._find_matching_aliases and accompanying unit tests. Implemented a targeted fix for DNS not supporting wildcard matching (addressing issue #13158) and added tests to verify correct behavior across common alias scenarios. This work improves DNS alias resolution reliability in dynamic, multi-tenant deployments and reduces manual configuration effort for users.

Monthly summary for 2025-07: Focused on stabilizing AWS endpoint behavior in sam-goodwin/alchemy by reverting environment variable-based customization and returning to standard AWS endpoints due to connectivity and configuration issues. Key actions included applying a rollback across two commits (781fe919186aa0f24e3f3778735a674f3b7e0143 and fd3071e938b16025f9050763a5843fcbee4f435e). Outcomes: restored reliability across environments, reduced incident risk, and preserved service availability with minimal customer impact. Skills demonstrated: AWS endpoint handling, environment-variable configuration, rollback strategy, Git traceability, and disciplined change control. Business value: improved stability, fewer outages, and smoother deployments.