You can read more about this release in this blog post
Event Store 5.0.1 Changelog
Changes
#1915 - (Core Database) Fix idempotent writes for cases where events have not yet been replicated. This bug can cause the loss of events during idempotent writes. Please read the blog post for more details
#1908 - (Projections) Fix passing of wrong object to _subscriptionDispatcher.Subscribed() call, which can cause multi-stream projections (using fromStreams or fromCategories) to skip processing of an event when the projection is stopped and started
#1900 - (Projections) Fix $by_category processing of stream deleted events
#1921 - (Projections) Add missing assignment to ProjectionsQueryExpiryDefault (thanks to @mcollins4551!)
#1882 - (Projections) Ignore IsJson property in $by_correlation_id projection
#1920 - (Index) Fix assertion regarding number of midpoints cached
#1890 - (Persistent Subscriptions) Persistent subscriptions: Ignore replayed events during checkpointing
#1886 - (Subscriptions) Fix issue where proto3 clients could not subscribe to $all
#1914 - (Scavenging) Don’t MarkForDeletion a chunk until all references to it have been swapped (thanks to @lscpike!)
#1918 - (Scavenging) Add regular file flushes whilst writing out scavenged chunk (thanks to @lscpike!)
#1919 - (User Management) Retry reading from $users-password-notifications stream if the read times out
#1873 - (Monitoring) Write stats csv header when date changes (when stats file rolls over)
#1926 - (Monitoring) Increase the slow queue message threshold to 800ms for the MonitoringQueue
#1888 - (HTTP API) Do not send Content-Type header when body is empty
#1881 - (HTTP API) Try to deserialize data or metadata string to JSON object when writing through HTTP API
#1884 - (HTTP API) Handle GET and POST requests on /users endpoints (instead of only /users/)
#1887 - (Windows) Use absolute path as mutex name when starting up node
#213 - (UI) Added Placeholder for password field in the login form
#214 - (UI) Fix typo
#219 - (UI) Parse $state parameters as ints in scavenge view