repokitteh: adding warning about draft PRS

CONTRIBUTING.md

@@ -102,7 +102,7 @@ versioning guidelines:
 
   Please see [support/README.md](support/README.md) for more information on these hooks.
 
-* Create your PR. If your PR adds new code, it should include tests [covering](source/docs/coverage.md) the new code.
+* Create your PR. If your PR adds new code, it should include tests [covering](source/docs/coverage.md) the new code. Please note that draft PRs may not be reviewed and will likely not be triaged, so do not create your PR as a draft if you want prompt reviews!
 * Tests will automatically run for you.
 * We will **not** merge any PR that is not passing tests.
 * PRs are expected to have 100% test coverage for added code. This can be verified with a coverage

ci/repokitteh/modules/newcontributor.star → ci/repokitteh/modules/newpr.star

@@ -8,26 +8,52 @@ In the meantime, please take a look at the [contribution guidelines](https://git
 
 """
 
+DRAFT_MESSAGE = """
+As a reminder, PRs marked as draft will not be automatically assigned reviewers,
+or be handled by maintainer-oncall triage.
+
+Please mark your PR as ready when you want it to be reviewed!
+"""
+
+
 def get_pr_author_association(issue_number):
   return github.call(
     method="GET",
     path="repos/envoyproxy/envoy/pulls/%s" % issue_number)["json"]["author_association"]
 
+def get_pr_is_draft(issue_number):
+  return github.call(
+    method="GET",
+    path="repos/envoyproxy/envoy/pulls/%s" % issue_number)["json"]["draft"]
+
 def is_newcontributor(issue_number):
   return (
     get_pr_author_association(issue_number)
     in ["NONE", "FIRST_TIME_CONTRIBUTOR", "FIRST_TIMER"])
 
+def is_draft(issue_number):
+  return (get_pr_is_draft(issue_number) is True)
+
 def should_message_newcontributor(action, issue_number):
   return (
     action == 'opened'
     and is_newcontributor(issue_number))
 
+def warn_about_drafts(action, issue_number):
+  return (
+    action == 'opened'
+    and is_draft(issue_number))
+
 def send_newcontributor_message(sender):
   github.issue_create_comment(NEW_CONTRIBUTOR_MESSAGE % sender)
 
+def send_draft_wip_notice(sender):
+  github.issue_create_comment(DRAFT_MESSAGE)
+
 def _pr(action, issue_number, sender, config):
   if should_message_newcontributor(action, issue_number):
     send_newcontributor_message(sender)
+  if warn_about_drafts(action, issue_number):
+    send_draft_wip_notice()
 
 handlers.pull_request(func=_pr)