Well, this announcement https://techcrunch.com/2018/09/04/atlassian-launches-jira-op... by Jira, 2 days ago, regarding Jira Ops and their acquisition of OpsGenie, might have helped PagerDuty (don't want to downplay PagerDuty's value here) to get that valuation.

I think this is good news!

Edit: formatting, added more precision