Monthly summary for 2025-08 focusing on scylladb/scylla-cluster-tests. Key highlights: - Delivered targeted enhancements to Alternator backup/restore testing in Scylla Manager, introducing a new test case that validates end-to-end backup/restore flows and expands coverage for table tags, special characters in table names, and secondary indexes. - Updated test infrastructure to reflect new testing scenarios: bumped YCSB Docker image version and added configuration options for testing Alternator table features, enabling more robust and repeatable test runs. Impact: - Improves validation of Alternator backup/restore reliability, reducing risk of regression in backup/restore paths and increasing confidence before production rollout. - Expands test coverage to support more real-world table configurations, including complex names and index scenarios. Commit reference: - 986944ea70f2cc3a985fe4175611d52ec02a8fd7 (feature: mgmt_cli_test.py: adds test of Scylla Manager Alternator restore)