turn off checking external repos by default

Fixes: https://pagure.io/koji/issue/2159

docs/source/utils.rst

@@ -85,6 +85,10 @@ especially in relation to throttling in creating ``newRepo`` tasks.
     How many repos are being removed from disk in one iteration. This
     generally doesn't need to be changed.
 
+``check_external_repos = false``
+    Check also external repos, note, that you need to have your database set to
+    use UTC, as otherwise you can end with weird behaviour. For details see
+    https://pagure.io/koji/issue/2159
 
 Garbage Collector
 -----------------

util/kojira

@@ -1030,7 +1030,7 @@ def get_options():
                 'deleted_repo_lifetime': 7 * 24 * 3600,
                 # XXX should really be called expired_repo_lifetime
                 'dist_repo_lifetime': 7 * 24 * 3600,
-                'check_external_repos': True,
+                'check_external_repos': False,
                 'recent_tasks_lifetime': 600,
                 'sleeptime': 15,
                 'cert': None,

util/kojira.conf

@@ -51,3 +51,8 @@ logfile=/var/log/kojira.log
 
 ; ignored repositories according to glob. Multiple masks separated by space.
 ; ignore_tags =
+
+; check also external repos, note, that you need to have your database set to
+; use UTC, as otherwise you can end with weird behaviour. For details see
+; https://pagure.io/koji/issue/2159
+; check_external_repos = false