nice addition to recent IOS-XE images is the info in BGP view when the peak number of prefixes was received:

rtr-edge#sh bgp ipv4 unicast summary
6807 received paths for inbound soft reconfiguration
BGP activity 1126906/107856 prefixes, 1337822/171863 paths, scan interval 60 secs
878960 networks peaked at 15:02:09 Jan 29 2022 CET (22:53:01.065 ago)

rtr-edge#sh bgp ipv6 unicast summary
BGP using 102467162 total bytes of memory
BGP activity 1126898/107856 prefixes, 1337806/171843 paths, scan interval 60 secs
140720 networks peaked at 05:46:19 Jan 29 2022 CET (1d08h ago)

while logged in over CLI you may glance at this info without needing to check your monitoring systems (you have them, right?).