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Release notes
Akka Insights 2.22
Migration Guide: Migration guide for Akka Insights 2.22
This release of Akka Insights (Cinnamon) adds exclusive support for Akka 25.10.
From Cinnamon 2.18 onward, each Cinnamon release will only support a single Akka release.
See Akka module versions for 25.10.
The following versions of Scala and Java are supported:
- Scala 2.13 and 3.3
- Java 11, 17, 21, and 25.
New features in Akka Insights 2.22
- Java 25 support.
- Additional metrics for Cluster Sharding instrumentation that requires akka-core
2.10.17or later. - Option to use non-blocking UUID generation for MDC.
- Updated the bundled OpenTelemetry dependency to
1.64.0(resolves CVE-2026-45292).
Bug fixes in Akka Insights 2.22
- Fix an issue where metrics for actor mailbox and stash sizes were not handled correctly when threshold events were enabled.
- The
cinnamon-opentelemetrybackend no longer depends on OpenTelemetry’s incubating events API (EventLogger), which was removed in OpenTelemetry 1.47.0. This allows applications to upgrade to a current OpenTelemetry release without the backend failing to start with aNoClassDefFoundError. Events are now emitted through the stable OpenTelemetry logs API. - Hardened OpenTracing span completion: an exception thrown by the configured tracer while finishing a span (e.g. reporter/serializer failures) is now caught and logged instead of propagating into the instrumented call site, where it could previously fail shared Akka HTTP stages and take down unrelated in-flight requests.
As part of moving off the removed incubating events API, the data map passed when an event is fired is now recorded as attributes on the emitted log record, rather than in the log record body (which the incubating API used). The event.name attribute and severity are unchanged. Adjust any log/event pipelines that read this payload from the record body.
As of OpenTelemetry 1.62, OTLP exporters enable a default retry policy (5 attempts, 1s–5s backoff, ×1.5). Previously no retry was applied unless explicitly configured. Cinnamon’s cinnamon.opentelemetry.{metrics,logs} OTLP exporters inherit this default; set retry-policy explicitly to override it.