## Why?
To introduce AMQP over WebSocket, we will add gun to the Erlang AMQP
1.0 client. We want to add the latest version of gun for this new
feature. Since rabbitmq_peer_discovery_etcd depends on the outdated
eetcd 0.3.6 which in turn depends on the outdated gun 1.3.3, this commit
first upgrades eetcd and gun.
## How?
See https://github.com/zhongwencool/eetcd?tab=readme-ov-file#migration-from-eetcd-03x-to-04x
## Breaking Changes
This commit causes the following breaking change:
`rabbitmq.conf` settings
* `cluster_formation.etcd.ssl_options.fail_if_no_peer_cert`
* `cluster_formation.etcd.ssl_options.dh`
* `cluster_formation.etcd.ssl_options.dhfile`
are unsupported because they are not valid `ssl:tls_client_option()`.
See https://github.com/erlang/otp/issues/7497#issuecomment-1636012198
* A new dependency on eetcd (ASL2-licensed)
* Connection management
* Lease acquisition for node key
* Initial registration function implementation
With assistance from @kjnilsson.
Part of #22.
For consistency with the name rabbitmq-peer-discovery-consul now uses. That backend
was updated to support both keys as well.
References rabbitmq/rabbitmq-peer-discovery-consul#20.
Michael Klishin
David Ansari
Michael Klishin
Michael Klishin
Michael Klishin
Luke Bakken