Supported reply_to_message_id for Telegram topics.

config/notifiers.go

@@ -756,6 +756,7 @@ type TelegramConfig struct {
 	Message              string `yaml:"message,omitempty" json:"message,omitempty"`
 	DisableNotifications bool   `yaml:"disable_notifications,omitempty" json:"disable_notifications,omitempty"`
 	ParseMode            string `yaml:"parse_mode,omitempty" json:"parse_mode,omitempty"`
+	ReplyToMessageID     int64  `yaml:"reply_to_message_id,omitempty" json:"reply_to_message_id,omitempty"`
 }
 
 // UnmarshalYAML implements the yaml.Unmarshaler interface.

docs/configuration.md

@@ -1120,6 +1120,18 @@ attributes:
 # ID of the chat where to send the messages.
 [ chat_id: <int> ]
 
+# id of the message in response to which the notification will be sent.
+# Primarily intended for sending notifications to a specific Telegram topic.
+# see https://telegram.org/blog/topics-in-groups-collectible-usernames
+# To do this, you need to pass the id of the first message in the topic by this parameter.
+# In order to find out the id of the first message in a topic, in the Telegram desktop client,
+# right-click on the first message in the topic, select "Copy Message Link".
+# Get a link like:
+# https://t.me/c/1234567890/1234/1235
+# The second part of the link is the id of the first message in the topic:
+# 1234
+[ reply_to_message_id: <int> ]
+
 # Message template.
 [ message: <tmpl_string> default = '{{ template "telegram.default.message" .}}' ]
 

notify/telegram/telegram.go

@@ -91,6 +91,7 @@ func (n *Notifier) Notify(ctx context.Context, alert ...*types.Alert) (bool, err
 	}
 
 	message, err := n.client.Send(telebot.ChatID(n.conf.ChatID), messageText, &telebot.SendOptions{
+		ReplyTo:               &telebot.Message{ID: int(n.conf.ReplyToMessageID)},
 		DisableNotification:   n.conf.DisableNotifications,
 		DisableWebPagePreview: true,
 	})