Bugfixes:

• Fix integer overflow of variable storing the offset of page header map. Reported by @sms1222
• Fix broken backward compatibility for backups of versions 2.0.22, 2.0.24 and 2.0.25. Affected version: 2.4.10. Reported by @shab2
• Do not delete invalid full backups within retention redundancy range. Reported by @triwada
• Correctly handle backups with empty backup.control. Reported by Mikhail Grigorev
• Empty WAL .history files are now handled correctly. Reported by Denis Podolsky
• Do no report meaningless timestamp when deleting backup without valid "recovery-time" attribute. Reported by Roman Zharkov
• Detect failure in WAL streaming correctly and report it as soon as possible. Reported by Yuri Kurenkov (#346)
• Do sync and rename when writing to configuration file pg_probackup.conf
• More robust parsing of tablespace_map content. Reported by Vasiliy Puchkov

Improvements:

• At the start of incremental backup the timeline switch of PostgreSQL instance is now detected automatically via replication protocol using TIMELINE_HISTORY command. Requested by Alex Ignatov
• Flags --no-validate and --no-sync are now can be used when running merge or retention merge operations.

Issues:
https://github.com/postgrespro/pg_probackup/milestone/28?closed=1