Limit blocks to 50 per message

slack_utils/slack_utils.go

@@ -51,17 +51,26 @@ func (s *SlackClient) SendAlertWithFields(message string, channel string, slackF
 		return ""
 	}
 
+	slackFieldsPerMessage := lo.Chunk(slackFields, 50) // Slack has a limit of 50 blocks per message
+
+	var messageTimestamp string
+	for i, slackFieldsForMessage := range slackFieldsPerMessage {
+		messageText := message
+		if len(slackFieldsPerMessage) > 1 {
+			messageText = fmt.Sprintf("%s (%d/%d)", message, i+1, len(slackFieldsPerMessage))
+		}
+
 		blocks := []slack.Block{slack.NewSectionBlock(slack.NewTextBlockObject(
 			"plain_text",
-		message,
-		hasEmoji(message),
+			messageText,
+			hasEmoji(messageText),
 			false),
 			nil,
 			nil,
 		),
 		}
 
-	slackFieldsChunked := lo.Chunk(slackFields, 2)
+		slackFieldsChunked := lo.Chunk(slackFieldsForMessage, 2)
 
 		for _, slackFieldsChunk := range slackFieldsChunked {
 			fieldBlocksForChunk := []*slack.TextBlockObject{}
@@ -92,7 +101,11 @@ func (s *SlackClient) SendAlertWithFields(message string, channel string, slackF
 			slackMessageOptions = append(slackMessageOptions, slack.MsgOptionTS(parentMessageTimestamp[0]))
 		}
 
-	return s.postMessage(channel, slackMessageOptions)
+		messageTimestamp = s.postMessage(channel, slackMessageOptions)
+	}
+
+	// Return the last message timestamp
+	return messageTimestamp
 }
 
 func (s *SlackClient) postMessage(channel string, messageOptions []slack.MsgOption) string {