changelog: mention #663 and #664

Signed-off-by: Pires <[email protected]>

CHANGELOG.md

@@ -52,6 +52,28 @@
   Thanks to [@pschultz](https://github.com/pschultz) and
   [@leprechau](https://github.com/leprechau) for the debugging and patch.
 
+* [PR #664](https://github.com/fabiolb/fabio/issues/664): Clean-up fabio service entries in Consul on dirty exit
+
+  In the case fabio dies abruptly, the steps to deregister any fabio-related
+  services in Consul will **not** take place.
+
+  In most cases, Consul will fail the fabio health check, mark the service as
+  unhealthy and delete it after `registry.consul.register.deregisterCriticalServiceAfter`
+  elapses.
+
+  However, in certain cases, for instance, where an automated recovery is in
+  place, the new instance of fabio could take over the same IP:port pair and
+  Consul would never fail the previous existing health check, meaning Consul
+  would now have duplicated service and respective check entries, or more
+  depending on how many times fabio as exited abruptly and was restarted.
+
+  This PR addresses this issue by registering a TTL check that is refreshed by
+  fabio
+
+  This PR also introduces missing documentation for the `registry.consul.register.deregisterCriticalServiceAfter` option.
+
+  Thanks to [@pires](https://github.com/pires) for the [report](https://github.com/fabiolb/fabio/issues/663) and the fix.
+
 #### Bug Fixes
 
 * [PR #577](https://github.com/fabiolb/fabio/pull/577): Fix ip access rules within tcp proxy