Extra alert information for the "Lost Upstream or Downstream" alert
This alert type is triggered when a relationship between your AS and another AS is observed to be lost.
Relationships can either be upstreams or downstreams, A “upstream” is generally an entity who provides you connectivity, and a downstream is generally considered a customer of yours.
You can read more about how bgp.tools detects these relationships by going to https://bgp.tools/kb/what-is-a-upstream