emqx Files

Enhancements

• #15364 Added support for custom HTTP headers in the OpenTelemetry gRPC (over HTTP/2) integration. This enhancement enables compatibility with collectors that require HTTP authentication.

• #15160 Added the DELETE /mt/bulk_delete_ns API for multi-tenancy management, which allows deleting namespaces in bulk.

• #15158 Added new emqx ctl conf remove x.y.z command, which removes the configuration key path x.y.z from the existing configuration.

• #15157 Added support for specifying private key file path for Snowflake Connector instead of using password.

Users should either use password, private key, or neither (set parameters in /etc/odbc.ini).

• #15043 Instrument the DS Raft backend with basic metrics to provide insights into cluster status, database overview, shard replication, and replica transitions.

Bug Fixes

Data Integration

• #15331 Fixed an issue in the InfluxDB action where line protocol conversion failed if the timestamp in WriteSyntax was left blank and no timestamp field was provided in the rule. Now the system's current millisecond value is used instead, and millisecond precision is enforced.

• #15274 Improved the resilience of Postgres, Matrix, and TimescaleDB connectors by triggering a full reconnection on any health check failure. Previously, failed health checks could leave the connection in a broken state, causing operations to hang and potentially leading to out-of-memory issues.

• #15154 Fixed a rare race condition in Actions running in aggregated mode (e.g., S3, Azure Blob Storage, Snowflake) that could lead to a crash with errors like:

** Reason for termination == ** {function_clause,[{emqx_connector_aggregator,handle_close_buffer,[...], ...

• #15147 Fixed an issue where some Actions failed to emit trace events during rule testing with simulated input data, even after request rendering.

Affected Actions:

• Couchbase
• Snowflake

• IoTDB (Thrift driver)

• #15383 Fixed a potential resource leak in the MQTT bridge. When the bridge failed to start, the topic index table was not properly cleaned up. This fix ensures that the index table is correctly deleted to prevent resource leaks.

Smart Data Hub

• #15224 Fixed an issue where updating an External Schema Registry via the Dashboard would unintentionally overwrite the existing password with ******. The password is now correctly preserved during updates.
• #15190 Enhanced Message Transformation by allowing hard-coded values for QoS and topic.

Observability

• #15299 Fixed a badarg error that occurred when exporting OpenTelemetry metrics.

Telemetry

• #15216 Fixed a crash in the emqx_telemetry process that could occur when plugins were activated.

Access Control

• #15184 Fixed the formatting of error messages returned when creating a blacklist fails.

Clustering

• #15180 Reduced the risk of deadlocks during channel registration by fixing improper handling of badrpc errors in the ekka_locker module. These errors previously led to false positives in lock operations, potentially causing inconsistent cluster state and deadlocks.

Security

• #15159 Improved handling of Certificate Revocation List (CRL) Distribution Point URLs by stopping their refresh after repeated failures (default: 60 seconds). This prevents excessive error logs from unreachable URLs and improves overall system stability.