[EU] Elevated delays for Fast (Preview) on non-current SDK versions

Resolved·Degraded performance

We've caught up again and improved our alerting to detect issues like this more proactively going forward.

Mon, Apr 20, 2026, 01:11 PM

(1 hour ago)

Affected components

09:10 AM

01:11 PM

Updates

Resolved

We've caught up again and improved our alerting to detect issues like this more proactively going forward.

Mon, Apr 20, 2026, 01:11 PM

Monitoring

Delays are below 60min again and trending further downwards.

Mon, Apr 20, 2026, 11:11 AM(2 hours earlier)

Investigating

We're currently observing delays for data in the "Fast (Preview)" mode for users that are not using the latest Langfuse SDK versions. The current delay exceeds 1h and we're actively working through the backlog.

Mon, Apr 20, 2026, 09:10 AM(2 hours earlier)