# Which Problems Are Solved
https://github.com/zitadel/zitadel/pull/8788 accidentally changed the
spelling of milestone types from PascalCase to snake_case. This breaks
systems where `milestone.pushed` events already exist.
# How the Problems Are Solved
- Use PascalCase again
- Prefix event types with v2. (Previous pushed event type was anyway
ignored).
- Create `milstones3` projection
# Additional Changes
None
# Additional Context
relates to #8788
# Which Problems Are Solved
Milestones used existing events from a number of aggregates. OIDC
session is one of them. We noticed in load-tests that the reduction of
the oidc_session.added event into the milestone projection is a costly
business with payload based conditionals. A milestone is reached once,
but even then we remain subscribed to the OIDC events. This requires the
projections.current_states to be updated continuously.
# How the Problems Are Solved
The milestone creation is refactored to use dedicated events instead.
The command side decides when a milestone is reached and creates the
reached event once for each milestone when required.
# Additional Changes
In order to prevent reached milestones being created twice, a migration
script is provided. When the old `projections.milestones` table exist,
the state is read from there and `v2` milestone aggregate events are
created, with the original reached and pushed dates.
# Additional Context
- Closes https://github.com/zitadel/zitadel/issues/8800
