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3068a0aa70
In order to simulate a production environment as closely as possible, we implement a failure detector which uses heartbeats for deciding whether to convict a server as failed. We convict a server if we don't receive a heartbeat for a long enough time. Similarly to `rpc`, `failure_detector` assumes a message passing method given by a `send_heartbeat_t` function through the constructor. `failure_detector` uses the knowledge about existing servers to decide who to send heartbeats to. Updating this knowledge happens through `add_server` and `remove_server` functions.