I greped git-log and picked up these some examples:
- phab:rMW52167c9: in 1.24 "Remove deprecated Title::userCanRead()" hard-deprecated since 1.19
- phab:rMW39dd076: in 1.24 "Remove Title::escapeFullURL() (deprecated since 1.19)" hard-deprecated since 1.19
- phab:rMWf27203e: in 1.29 "Removed deprecated class RevisiondeleteAction" hard-deprecated since 1.25
- phab:rMWc81540d: in 1.26 "Remove deprecated $wgSpecialPageGroups" hard-deprecated since 1.21 + phab:rMWd06aaa9b20 "Do not allow setting deprecated $wgSpecialPageGroups over extension.json" warning about this config parameter in the tool creating extension.json
- Deprecation of non-RL in Gadgets