I am seeing a log of BGP flapping events for AS 61955 in https://librenms.wikimedia.org/eventlog, found it by chance while checking another issue. Not sure if it is already handled by other means (icinga didn't show anything), in case sorry for the spam :)
We don't monitor our IX peers much.
We probably should configure BGP route damping, https://www.juniper.net/documentation/en_US/junos/topics/usage-guidelines/policy-using-routing-policies-to-damp-bgp-route-flapping.html
To reduce router churn as well as improve user experience.