# Tinybird: A significant fraction of Clickhouse replicas marked as unhealthy

- Impact (vendor’s label): minor
- Status: resolved
- Started: 2026-07-28 06:44 UTC · Resolved: 2026-07-28 08:04 UTC · Duration: 1.3 h
- Updates: 4 · Affected components: API Endpoints, BI Connector, Kafka, Query API, Events API, Query API, API Endpoints, Events API, Kafka, Copy, CSV Imports, CSV Imports, Copy, Kafka, Events API, CSV Imports, Query API, API Endpoints, Copy, Sinks, Sinks, Sinks, Login, S3 Connector, Login, S3 Connector, S3 Connector, Login, Login, API Endpoints, Events API, S3 Connector, BI Connector, Query API, Kafka, CSV Imports, Sinks, Copy, DynamoDB Connector, DynamoDB Connector, DynamoDB Connector, Login, Copy, Events API, Kafka, API Endpoints, Sink, Query API, S3 Connector, GCS Connector, GCS Connector, GCS Connector, GCS Connector, GCS Connector, Query API, GCS Connector, S3 Connector, Events API, Copy, Sinks, Kafka, API Endpoints, Login, Sinks, Login, Sinks, API Endpoints, S3 Connector, Events API, Events API, Copy, GCS Connector, Query API, Login, API Endpoints, GCS Connector, Kafka, Query API, Kafka, Copy, S3 Connector, ClickHouse HTTP Interface, ClickHouse HTTP Interface, ClickHouse HTTP Interface, ClickHouse HTTP Interface, ClickHouse HTTP Interface, ClickHouse HTTP Interface, ClickHouse HTTP Interface, ClickHouse HTTP Interface
- [Vendor status page: https://status.tinybird.co/incidents/01KYKQFHR96KCJTZ8G3FN0K8W1](https://status.tinybird.co/incidents/01KYKQFHR96KCJTZ8G3FN0K8W1)
- [Company: Tinybird](https://rewindex.com/company/tinybird.md)

## Timeline of updates

- **investigating** 2026-07-28 06:44 UTC: Some database replicas have been marked as unhealthy incorrectly. This is affecting how traffic is distributed among healthy replicas, and in some clusters it's resulting in degraded performance and some errors.
- **monitoring** 2026-07-28 07:20 UTC: We've marked as healthy the database replicas that were incorrectly marked as unhealthy. We're confirming the cause and have a few suspects.   We keep monitoring the situation.
- **monitoring** 2026-07-28 07:38 UTC: We have narrowed the root cause to an automatic Ubuntu package upgrade triggering the restart of our database services on many servers, and those being marked unhealthy as a result. Service should be generally restored already.
- **resolved** 2026-07-28 08:04 UTC: We've confirmed that service has been restored fully.


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Canonical: https://rewindex.com/company/tinybird/incidents/01KYKQFHR96KCJTZ8G3FN0K8W1 · Markdown: https://rewindex.com/company/tinybird/incidents/01KYKQFHR96KCJTZ8G3FN0K8W1.md · JSON: https://rewindex.com/api/v1/companies/tinybird/incidents/01KYKQFHR96KCJTZ8G3FN0K8W1 · Generated 2026-10-18T12:32:35.255Z