[Improvement] Added the ability to require a reCAPTCHA for notification subscribers

[Improvement] Automatically use the message subject defined in the custom templates if the message_subject parameter is not defined in API requests

[Improvement] Various interface improvements in the Dashboard

[Fix] Remediated an XSS issue for incident and maintenance page views

[Fix] Remediated an XSS issue for managing notification subscriptions

[Fix] Resolved an issue where the metric chart would ignore the configured time zone and only display the times in UTC

[Improvement] Added search functionality for subscriber lists

[FIX] Fixed XSS bug for manage subscriptions

[Fix] Fixed formatting issue where a leading space was added to infrastructure names

[Improvement] Added changelog notifications in the Dashboard

[Improvement] Provide feedback when validating the affected infrastructure for new incidents and maintenances

[Improvement] Changed the post button to prevent duplicates when creating or updating incidents and maintenances

[Fix] Added validation for time values when scheduling new maintenances

[Improvement] Added new Linode data center (Mumbai, India) to infrastructure locations

[Improvement] Optimized the web address and SSL configurations

[Improvement] Minor Dashboard UX enhancements

[Improvement] Added new AWS regions to infrastructure locations

[Fix] Slack “Load More Subscribers” button fixed

[Fix] Notification message template variables (PREVIOUSSTATUS and PREVIOUSSTATE)