Mattermost Support is available for paying customers of Mattermost Professional or Enterprise Self-Hosted and Cloud. For more information on support options, please visit: https://about.mattermost.com/support/
Urgent and High are meant for production affecting incidents according to our SLA documentation at: https://support.mattermost.com/hc/en-us/articles/4413076086548-Mattermost-Support-service-levels-and-their-severity
Mattermost's Incident Level Definitions can be reviewed at: https://mattermost.com/support-terms/#incident-level-definitions
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