Fix too long declare incident link (#1342)

# What this PR does

## Which issue(s) this PR fixes
Issue with too long declare incident link in Slack

## Checklist

- [x] `CHANGELOG.md` updated

CHANGELOG.md

@@ -5,6 +5,12 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## Unreleased
+
+### Fixed
+
+- Fixed too long declare incident link in Slack
+
 ## v1.1.24 (2023-02-16)
 
 ### Added

engine/apps/alerts/models/alert_group.py

@@ -480,6 +480,7 @@ class AlertGroup(AlertGroupSlackRenderingMixin, EscalationSnapshotMixin, models.
         incident_link = urljoin(self.channel.organization.grafana_url, "a/grafana-incident-app/incidents/declare/")
         caption = urllib.parse.quote_plus("OnCall Alert Group")
         title = urllib.parse.quote_plus(self.web_title_cache) if self.web_title_cache else DEFAULT_BACKUP_TITLE
+        title = title[:2000]  # set max title length to avoid exceptions with too long declare incident link
         link = urllib.parse.quote_plus(self.web_link)
         return urljoin(incident_link, f"?caption={caption}&url={link}&title={title}")