Isitreallydown?
// Incident Post-MortemDRN-F5D18B35

Slack outage on December 9, 2025

Major severityResolved45 minProductivity
Started · UTC
Dec 09, 05:29 PM
154d ago
Resolved · UTC
Dec 09, 06:14 PM
154d ago
Duration
45 min
End-to-end
Peak confidence
80.00
0 snapshots
// What happened

Slack appears to be operating normally based on current signals. Isitreallydown?'s synthetic checks are not yet measured, DNS is not yet measured, user reports are quiet.

Cached · Tue, May 12, 2026, 12:24 PM UTC · scope: service signals

// Timeline
  1. Incident detected

    Major confidence crossed the incident threshold for Incident: Trouble with Search.

  2. Marked resolved

    The incident was closed after 45 min of observed impact.

// Signals by source0 sources

No per-source signal payloads were preserved in this incident's snapshot window.

// Aggregate evidence

Confidence scoring

80.00

The incident reached 80.00 peak confidence across available stored status snapshots.

User reports

0 / 15m

No elevated user-report volume was preserved in the incident window snapshots.

Status samples

0 affected

The incident row exists, but the bounded snapshot window does not include affected status samples.

Recovery signal

Resolved

Recovery was recorded at Tue, Dec 09, 2025, 06:14 PM UTC.

// User impact

Slack users likely saw failed connections, degraded availability, or session instability for this Productivity service. The incident reached Major severity and lasted 45 min. The stored report window does not show a preserved user-report spike.