Maiko v0.2.6

0.2.6 (February 22nd, 2026)

Added

• ActorMonitor to track monitor lifecycle (#83, #86)
• Why Maiko and Getting started docs (#85)

Changed

• actor-broker communication moved from single global channel to channel per actor-broker pair (#84)
• moved repo from personal account to maiko-rs organization (#87)
• documentation improvements (#88)

Maiko v0.2.5

0.2.5 (February 17th, 2026)

Backpressure handling

Added

• OverflowPolicy enum (#75)
• overflow_policy method in Topic (defaulting to OverflowPolicy::Fail) (#75)
• on_overflow method in Monitor (and implementation in Tracer) (#75)
• ActorConfig - configs allowing to fine-tune actors behavior (#76)
• ActorBuilder - for more fine-grained actor building (including config) (#76)

Changed

• Moved from MIT to dual license (MIT + Apache 2.0) (#77)
• Event broker to respect OverflowPolicy (#75)
• The main Config to act as a default for ActorConfig (#76)
• Non-breaking changes to align Maiko with the API guidelines (#70)

Maiko v0.2.4

0.2.4 (February 15th, 2026)

Bug fixes

• Fixes dependency on old version of maiko-macros (#71)

Maiko v0.2.3

0.2.3 (February 12th, 2026)

Contains Breaking changes (in test harness only)

Added

• Label trait and derive macro (#56)
• to_mermaid method in Supervisor (#56)
• to_json method in Supervisor (#59) - thanks for contribution, @swaploard

Test Harness additions:

• EventChain in test harness for correlation tracking (#62)
• ActorTrace and EventTrace views on EventChain with exact(), segment(), and passes_through() methods (#62)
• EventQuery - multiple new methods (#66)
• EventSpy.not_delivered_to(), .was_delivered_to_all(), .delivery_ratio()
• Harness.settle_on() — condition-based settling with Expectation builder and .within() timeout (#66)

Changed

• Broker logic to drop events rather than fail on overflow (#67)
• Breaking: EventRecords now uses Arc<Vec<EventEntry>> internally (zero-copy sharing across spies/queries) (#62)
• Breaking: ActorSpy and EventSpy - polished API with some methods renamed (#62, #66)
• Breaking: EventQuery.collect() now returns unique events (deduplicated by ID); old behavior available via all_deliveries() (#62)

Removed

• Breaking: Harness.start_recording(), stop_recording(), settle_with_timeout() removed (use record(), settle(), settle_on() instead) (#66)

Maiko v0.2.2

0.2.2 (February 4th, 2026)

Added

• Recorder monitor for recording events to JSON Lines files (#49) - thanks for contribution, @WojtekRewaj
• Tracer monitor for logging event lifecycle via tracing crate (#52)
• monitors module for built-in monitor implementations (#52)

Changed

• Error enum no longer implements Clone (allows deriving from non-Clone errors) (#49)
• Reorganized monitoring: monitoring module for engine, monitors for implementations (#52)
• Improved documentation

Maiko v0.2.1

0.2.1 (January 29th, 2026)

Added

• SelfRouting macro for making events to act as topics
• Frequently Asked Questions

Changed

• ActorId has a public constructor now
• Improved documentation and README
• Moved doc to docs

Maiko v0.2.0

0.2.0 (January 27th, 2026)

Contains Breaking changes!

Key new Features

1. Adopted Maiko to work with project Charon as a first library use case. #23
2. Number of ergonomy improvements (API changes!) #33, #37
3. Monitoring API #36
4. Test harness #31

Added

• StepAction enum to control step function behavior
• serde feature that makes events serializable/deserializable
• External option in Error enum
• clone_name method in Context

Changed

• Renamed tick to step in Actor
• Renamed handle to handle_event in Actor
• Fields of Envelope made private (use methods instead)

Maiko v0.1.1

Added

• hello-wrold.rs example
• maintenance_interval option added to Config
• Broker removes closed subscribers in periodical cleanup method
• pending method added to Context
• graceful shutdown - completes pending events before stop

Changed

• Main ActorHandle loop to work with tokio::select!
• Detailed documentation aded to examples.
• PingPong example with events as topics.
• Improved performance of subscribers lookup in Broker
• Broadcast topic renamed to DefaultTopic
• Broker has now dedicated cancellation token (rather than shared one with actors)

Maiko v0.1.0 (MVP)

0.1.0 (December 14th, 2025)

MVP. Fully-functional, teset, yet quite minimal version.

Added

• Event derive macro #3
• Documentation and examples #4
• Event correlation logic #7

Deleted

• dependency on async-trait (#5)

Changed

• renamed DefaultTopic to Broadcast
• changed channel data type from Envelope<E> to Arc<Envelope<E>>
• made broker working with non-blocking send

Maiko v0.0.2

What's Changed

• First working version