| ⇢ | C | InstallerBase added | |
| ⇢ | A | GroupRatingCalculator added | |
| ⇢ | A | GroupAnalysisExport added | |
| ⇢ | A | Install added | |
| ⇢ | A | Synchronizer added | |
| ⇢ | A | Curl added | |
| ⇢ | A | Submitter added | |
| ⇢ | A | Languages added | |
| ⇢ | A | Privileged added | |
| ⇢ | A | CrawlerBase added | |
| ⋮ | view more | ||
| A | ↘ | F | GroupController got worse |
| A | ↘ | F | GroupModel got worse |
| F | ↛ | Judge removed | |
| F | ↛ | Judge removed | |
| A | ↛ | Vijos removed | |
| A | ↛ | ContestHunter removed | |
| A | ↛ | CodeForces removed | |
| A | ↛ | Submit removed | |
| A | ↛ | CodeForces removed | |
| A | ↛ | CrawlerBase removed | |
| A | ↛ | Curl removed | |
| A | ↛ | Core removed | |
| ⋮ | view more | ||