chronyでのステータス確認方法

$ sudo chronyc sources -v
210 Number of sources = 1

.-- Source mode '^' = server, '=' = peer, '#' = local clock.
/ .- Source state '*' = current synced, '+' = OK for sync, '?' = unreachable,

/ 'x' = time may be in error, '~' = time is too variable.
	.- xxxx [ yyyy ] +/- zzzz
	/ xxxx = adjusted offset,
	Log2(Polling interval) -.	yyyy = measured offset,
	\	zzzz = estimated error.

MS Name/IP address Stratum Poll LastRx Last sample
============================================================================
^* ntp-a2.nict.go.jp 1 10 593 +401us[ +435us] +/- 7429us