Hello,
As shown in the figure, through ping, v6.49.2 can obtain the received value of 2; but v7.2.1 obtains the received value is empty (nil).
In v7.x, this method can no longer be used to obtain the received value. Is there any other way to obtain the received value?

Missing ping number seems to only bee seen with count=2. Try count=3
This looks like a bug and MT should fix it.
[jotne@RB951-2] > :put [:ping 8.8.8.8 count=2]
Columns: SEQ, HOST, SIZE, TTL, TIME
SEQ HOST SIZE TTL TIME
0 8.8.8.8 56 53 17ms540us
1 8.8.8.8 56 53 17ms770us
[jotne@RB951-2] > :put [:ping 8.8.8.8 count=3]
SEQ HOST SIZE TTL TIME STATUS
0 8.8.8.8 56 53 17ms843us
1 8.8.8.8 56 53 17ms499us
2 8.8.8.8 56 53 17ms694us
sent=3 received=3 packet-loss=0% min-rtt=17ms499us avg-rtt=17ms678us max-rtt=17ms843us
3