meta: notify #t-rustdoc Zulip stream on backport nominations

triagebot.toml

@@ -417,6 +417,54 @@ message_on_remove = "Issue #{number}'s prioritization request has been removed."
 message_on_close = "Issue #{number} has been closed while requested for prioritization."
 message_on_reopen = "Issue #{number} has been reopened."
 
+# FIXME: Patch triagebot to support `notify-zulip.<label>` getting mapped to an array of actions.
+#        At the moment, the beta-nominated+T-rustdoc action fully occupies the beta-nominated slot
+#        preventing others to add more beta-nominated triggers.
+[notify-zulip."beta-nominated"]
+required_labels = ["T-rustdoc"]
+zulip_stream = 266220 # #t-rustdoc
+topic = "beta-nominated: #{number}"
+# Zulip polls may not be preceded by any other text and pings & short links inside
+# the title of a poll don't recognized. Therefore we need to send two messages.
+message_on_add = [
+    """\
+@*T-rustdoc* PR #{number} "{title}" has been nominated for beta backport.
+""",
+    """\
+/poll Approve beta backport of #{number}?
+approve
+decline
+don't know
+""",
+]
+message_on_remove = "PR #{number}'s beta-nomination has been removed."
+message_on_close = "PR #{number} has been closed. Thanks for participating!"
+message_on_reopen = "PR #{number} has been reopened. Pinging @*T-rustdoc*."
+
+# FIXME: Patch triagebot to support `notify-zulip.<label>` getting mapped to an array of actions.
+#        At the moment, the stable-nominated+T-rustdoc action fully occupies the stable-nominated slot
+#        preventing others to add more stable-nominated triggers.
+[notify-zulip."stable-nominated"]
+required_labels = ["T-rustdoc"]
+zulip_stream = 266220 # #t-rustdoc
+topic = "stable-nominated: #{number}"
+# Zulip polls may not be preceded by any other text and pings & short links inside
+# the title of a poll don't recognized. Therefore we need to send two messages.
+message_on_add = [
+    """\
+@*T-rustdoc* PR #{number} "{title}" has been nominated for stable backport.
+""",
+    """\
+/poll Approve stable backport of #{number}?
+approve
+decline
+don't know
+""",
+]
+message_on_remove = "PR #{number}'s stable-nomination has been removed."
+message_on_close = "PR #{number} has been closed. Thanks for participating!"
+message_on_reopen = "PR #{number} has been reopened. Pinging @*T-rustdoc*."
+
 [notify-zulip."I-types-nominated"]
 zulip_stream = 326866 # #T-types/nominated
 topic = "#{number}: {title}"