database · inferred from evidence
ClickHouse
A column-oriented DBMS used for storing and querying log metadata in this context.
- UI errors loading traces after Langfuse upgrade: corrupted ClickHouse parts
The root cause was storage corruption in ClickHouse data parts (not a migration bug; dirty flags in schema_migrations are normal: golang-migrate always writes a dirty=1 row followed by dirty=0). The maintainer's guidance: run `CHECK TABLE t
- Upgrading to SigNoz 0.57.0 broke log-based value widgets (report 0)
Root cause: stale metadata in ClickHouse. If your team ever switched from log attributes to resource attributes (e.g. for service.name), the old tag keys stay in `distributed_logs_attribute_keys` / `distributed_tag_attributes`, and the old
- ClickHouse 23.8: steady memory growth after upgrade from 23.1 (Kafka statistics leak)
Set kafka.statistics_interval_ms to 0 in the Kafka config group (e.g. a new file under config.d) and restart ClickHouse. The reporter confirmed memory growth stopped after 16 hours. Upgrading past the versions containing PRs #57822 and #578