Add initial production manual for fiddle.

alertserver/alerts.cfg

Index: alertserver/alerts.cfg
diff --git a/alertserver/alerts.cfg b/alertserver/alerts.cfg
index 46cd543061dcb4e5999395736cf1909c24f3105e..8526c1d4dee9809ddd9d0bdfb4b270ca2fdd05ec 100644
--- a/alertserver/alerts.cfg
+++ b/alertserver/alerts.cfg
@@ -649,7 +649,7 @@ nag = "1h"
 #
 [[rule]]
 name = "fiddle is failing to build"
-message = "Fiddle has failed to build at the last 2 chrome DEPS rolls. Search logs for \"Failed to build LKGR:\" and \"Successfully built:\"."
+message = "Fiddle has failed to build at the last 2 chrome DEPS rolls. https://skia.googlesource.com/buildbot/+/master/fiddle/PROD.md#build_fail"
 database = "skmetrics"
 query = "SELECT mean(value) FROM \"counter\" WHERE app='fiddle' AND \"name\"='builds-failed' AND time > now() - 10m"
 category = "infra"
@@ -660,7 +660,7 @@ nag = "1h"
 
 [[rule]]
 name = "fiddle is failing to sync"
-message = "Fiddle has failed to sync to HEAD at least 2 times in a row. Search logs for \"Failed to update skia repo\"."
+message = "Fiddle has failed to sync to HEAD at least 2 times in a row. https://skia.googlesource.com/buildbot/+/master/fiddle/PROD.md#sync_fail"
 database = "skmetrics"
 query = "SELECT mean(value) FROM \"counter\" WHERE app='fiddle' AND \"name\"='repo-sync-failed' AND time > now() - 10m"
 category = "infra"