Implement heartbeat check-ins #195

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1 error and 10 warnings

The job was canceled because "_1_17_x_25_x" failed.

function upgrade/3 required by behaviour Plug.Conn.Adapter is not implemented (in module Plug.Adapters.Cowboy.Conn)

Application.get_env/3 is discouraged in the module body, use Application.compile_env/3 instead

Supervisor.Spec.worker/3 is deprecated. Use the new child specifications outlined in the Supervisor module instead

System.stacktrace/0 is deprecated. Use __STACKTRACE__ instead

Plug.Adapters.Cowboy.http/3 is deprecated. Use Plug.Cowboy.http/3 instead

Plug.Adapters.Cowboy.shutdown/1 is deprecated. Use Plug.Cowboy.shutdown/1 instead

FakeSystem.cmd/2 is undefined (module FakeSystem is not available or is yet to be defined)

FakeSystem.cmd/3 is undefined (module FakeSystem is not available or is yet to be defined)

variable "opts" is unused (if the variable is not meant to be used, prefix it with an underscore)

:simple_one_for_one strategy is deprecated, please use DynamicSupervisor instead