Note : for security reason i didn't mention hostnames and ips.
==============================================================================

[root@ ~]# ntpstat
unsynchronised
   polling server every 1024 s
Ntpstat showing unsynchronised.

==============================================================================

[root@~]# systemctl status ntpd
�-� ntpd.service - Network Time Service
   Loaded: loaded (/usr/lib/systemd/system/ntpd.service; enabled; vendor preset: disabled)
   Active: active (running) since Thu 2019-04-04 15:00:51 UTC; 5 months 17 days ago
 Main PID: 8275 (ntpd)
    Tasks: 1
   Memory: 20.0K
==============================================================================

And all poller ntp servers are reaching through ntp port and no packet loss. 


[root@ ~]# ntpq -p
     remote           refid      st t when poll reach   delay   offset  jitter
==============================================================================
   node1               2 u   64 1024    7    1.362   -4.212   3.041
    node2             2 u   65 1024    7    1.752   -4.089   3.023
   node3              2 u   64 1024    7   25.469   -4.160   2.876
    node4            2 u   63 1024    7   25.666   -4.238   2.930
    node5            2 u   66 1024    7   45.907   -5.017   3.054
  node6              2 u   65 1024    7   45.905   -4.499   3.045

==============================================================================
NTptime is giving return code 5;
[root@~]# ntptime
ntp_gettime() returns code 5 (ERROR)
  time e1305f50.e00d7fc8  Sat, Sep 21 2019  8:35:28.875, (.875206994),
  maximum error 16000000 us, estimated error 16000000 us, TAI offset 0
ntp_adjtime() returns code 5 (ERROR)
  modes 0x0 (),
  offset 0.000 us, frequency 43.490 ppm, interval 1 s,
  maximum error 16000000 us, estimated error 16000000 us,
  status 0x2041 (PLL,UNSYNC,NANO),
  time constant 10, precision 0.001 us, tolerance 500 ppm,
[root@~]# date
Sat Sep 21 08:35:33 UTC 2019

==============================================================================

This is the alert we're getting every time but usually, it's getting a fix within 10mins 

OP5 alert is :- 
'Check NTP Status' on host 'hostname' has passed the WARNING threshold.

Service: Check NTP Status
Service Notes: 

Status : WARNING
Notification Comment: 

Additional info:  
Warning - NTPd Health is 50% with 6 peer(s).

Thresholds:  Health (20%