This is more a service degradation / outage than an incident.
How do you differentiate outage from incident?
Could you be more specific? — "An incident at Slack"
Could you be more specific? — "An outage at Slack"
Could you be more specific? — "..."
Would rather see something more specific:
"File Upload & Emoji Service Degradation at Slack" ( — insert emoji memes ).
Arguably, title is a bit misleading whether it warrants front page news for this community.