node-reboot-chef-event-handler

# cookbook code
...

reboot 'soon' do
  delay_mins 2
  action :request_reboot
end

Chef.event_handler do
  on :run_failed do |exception, run_status|
    Chef::Log.warn "FAILED exception :: #{exception}"
    Chef::Log.warn "FAILED run status :: #{run_status}"

    Chef::Log.warn "FAILED reboot info :: #{run_status.run_context.reboot_info}"
  end

  on :run_completed do |node, run_status|
    Chef::Log.warn "COMPLETED node :: #{node}"
    Chef::Log.warn "COMPLETED run status :: #{run_status}"
    
    # this will be an empty hash if no reboot info
    # run_status.run_context.reboot_info.empty?
    Chef::Log.warn "COMPLETED reboot info :: #{run_status.run_context.reboot_info}"
  end
end

###########################
###########################

# chef-client output
...

Running handlers:
Running handlers complete
Chef Client finished, 1/1 resources updated in 01 seconds
[2019-05-01T18:39:04+00:00] WARN: COMPLETED node :: node[default-bento-centos-76]
[2019-05-01T18:39:04+00:00] WARN: COMPLETED run status :: #<Chef::RunStatus:0x0000000004dcfd30>
[2019-05-01T18:39:04+00:00] WARN: COMPLETED reboot info :: {:delay_mins=>2, :reason=>"Reboot by Chef", :timestamp=>2019-05-01 18:39:04 +0000, :requested_by=>"soon"}
[2019-05-01T18:39:04+00:00] WARN: Rebooting server at a recipe's request. Details: {:delay_mins=>2, :reason=>"Reboot by Chef", :timestamp=>2019-05-01 18:39:04 +0000, :requested_by=>"soon"}

Running handlers:
[2019-05-01T18:39:04+00:00] ERROR: Running exception handlers
Running handlers complete
[2019-05-01T18:39:04+00:00] ERROR: Exception handlers complete
Chef Client failed. 1 resources updated in 01 seconds
[2019-05-01T18:39:04+00:00] WARN: FAILED exception :: Rebooting server at a recipe's request. Details: {:delay_mins=>2, :reason=>"Reboot by Chef", :timestamp=>2019-05-01 18:39:04 +0000, :requested_by=>"soon"}
[2019-05-01T18:39:04+00:00] WARN: FAILED run status :: #<Chef::RunStatus:0x0000000004dcfd30>
[2019-05-01T18:39:04+00:00] WARN: FAILED reboot info :: {:delay_mins=>2, :reason=>"Reboot by Chef", :timestamp=>2019-05-01 18:39:04 +0000, :requested_by=>"soon"}
[2019-05-01T18:39:04+00:00] FATAL: Stacktrace dumped to /tmp/kitchen/cache/chef-stacktrace.out
[2019-05-01T18:39:04+00:00] FATAL: Please provide the contents of the stacktrace.out file if you file a bug report
[2019-05-01T18:39:04+00:00] FATAL: Chef::Exceptions::Reboot: Rebooting server at a recipe's request. Details: {:delay_mins=>2, :reason=>"Reboot by Chef", :timestamp=>2019-05-01 18:39:04 +0000, :requested_by=>"soon"}