Instance I-00000800 in group mediawiki-api has a web proxy graph.wmflabs.org that I do not see in the proxy mgmt. The instance also has a static IP 208.80.155.201. Nslookup returns 208.80.155.156 - what I assume to be the webproxy (I addeded it a long time ago, before the static IP). Adding a static hostname makes nslookup return both the static and web proxy IP.
Please delete the graph.wmflabs.org entry or make it show in the webproxies interface (so I can delete it myself). Do NOT delete the instance. :) Thanks!