ArangoDB version 3.10.9 released

[vadim]

We are happy to announce the release of ArangoDB version 3.10.9!

This patch version is ready for production deployment and is a recommended upgrade for all 3.10 users.

Apart from some basic cleanup and code improvements related to found issues, the following notable things have been added to the 3.10.9 version of ArangoDB:

• Added startup option `--replication.active-failover-leader-grace-period`.
• Add a `description` field to OptimizerRule and dump the explanations via the `GET /_api/query/rules` endpoint.

Full changelog can be found here: https://github.com/arangodb/arangodb/blob/v3.10.9/CHANGELOG.
 
Version 3.10.9 distributives can be obtained at https://www.arangodb.com/download/ and https://download.arangodb.com/arangodb310/.