Pre-release 0.9 in Series 12

• Native external services support. Standalone native services can now
  attach themselves to the Locators to be announced.
• 'Bootstrap is complete' core signal. Services can listen for this signal
  to hook into bootstrapping process.
• Blackhole v0.5.
• Bugfix: wrong lock held for certain Locator operations.
• Bugfix: routing streams are now also closed on Locator shutdown.
• Some optimizations and cleanup.

Pre-release 0.8 in Series 12

• Bugfix: fixed app vs. published services list inconsistency (PR #192).

Pre-release 0.7 in Series 12

• Remote connections are now retried on failure.
• Bugfix: endpoints while connecting remotes were corrupted in logs.

Pre-release 0.6 in Series 12

• External service support. Non-native services can now be exposed via the Cocaine service discovery mechanics, including gateway setup and stuff (PR #189).
• External routers can now hook up into RG path in Locator and sync all the routing group changes in realtime (PR #190).
• Bugfix: multiple versions of the same service in the cluster won't render such services unusable anymore (PR #191).

Pre-release 0.5 in Series 12

• Bugfix: sometimes new Sessions weren't properly registered with Engines.

Pre-release 0.4 in Series 12

• Multiple thread-safety fixes for Actor, Locator and others (PRs #177, #182, #183).
• Refactored Sessions to enable verbose error logging, at last (PR #181).
• Reverted setting of TCP_NODELAY option on client sockets.

Pre-release 0.3 in Series 12

• Bugfix: pass hostname instead of localhost in --locator command-line argument for slaves (PR #169).
• Bugfix: do not crash on context_t::locate() request for a non-existent service.
• Bugfix: properly handle invalid local endpoints for services.
• Bugfix: do not read/write from/to already deleted channels (PR #173).
• Bugfix: enforce optional argument ordering in service IDLs.

Pre-release 0.1 in Series 12

• Multithreaded Actor I/O. All incoming messages are now dispatched on a
  shared thread pool, which greatly speeds the things up.
• Protocol transitions. Service protocols can now specify state transitions
  to support dispatch hierarchies. For example, storage protocol can
  implement a write_stream() method, which switches to stream protocol on
  invocation, or Chrono Service can implement a cancellable_timeout() method
  by switching to a cancellable protocol.
• App streaming interface. Clients can stream data chunks into the app now,
  as opposed to sending a single request chunk along with the enqueue()
  method invocation.
• Dropped libev in favor of Boost.ASIO.
• Logging in now handled via the Blackhole logging library.
• Locator is now a proper service, without any special treatment. Local
  service management is a responsibility of the Context.
• Configurable cluster discovery mechanics, including multicast and predefine
  cluster discovery plugins.
• Routing groups re-implemented using Ketama consistent hashing continuums.

Release 2.0 in Series 11

• An ability to pick backends for the Logging Service.
• Bugfix: profile default grow threshold is now picked more carefully.
• Bugfix: correctly skip locator groups with weight sum of zero.

Release 1.0 in Series 11

• Docker containerization support.
• Routing groups. An ability to route requests to multiple versions of the same app based on weights and other metrics.
• Memory usage reports available from the Locator via the 'reports' method.
• Native Framework no longer has a binary dependency on Core libraries.
• Bugfix: IPv6 addresses use the proper storage size now.
• Bugfix: do not stop adding tags to a new object in the File Storage if one of the tags already exists.
• Bugfix: stop processing messages in died channels.