diff --git a/treeherder/config/settings.py b/treeherder/config/settings.py
index <HASH>..<HASH> 100644
--- a/treeherder/config/settings.py
+++ b/treeherder/config/settings.py
@@ -246,13 +246,15 @@ SILENCED_SYSTEM_CHECKS = [
 # User Agents
 # User agents which will be blocked from making requests to the site.
 DISALLOWED_USER_AGENTS = (
+    re.compile(r'^Go-http-client/'),
+    # This was the old Go http package user agent prior to Go-http-client/*
+    # https://github.com/golang/go/commit/0d1ceef9452c495b6f6d60e578886689184e5e4b
+    re.compile(r'^Go 1.1 package http'),
     # Note: This intentionally does not match the command line curl
     # tool's default User Agent, only the library used by eg PHP.
     re.compile(r'^libcurl/'),
     re.compile(r'^Python-urllib/'),
     re.compile(r'^python-requests/'),
-    # ActiveData blocked for excessive API requests (bug 1289830)
-    re.compile(r'^ActiveData-ETL'),
 )
Bug <I> - Update list of blocked User Agents (#<I>)

These Golang related User Agents are accessing only the site root and

robots.txt, so safe to block. The ActiveData UA block can be removed,

since ActiveData no longer makes requests to our API.