Root cause

Software bug

A latent defect in the vendor’s own software surfaced.

Incidents per month

October 2025September 2026

in 12 months

major or critical

21m

median duration

most affected

Incidents

IncidentStarted (UTC)DurationImpactRoot cause

ClickHouseClickPipes failing on Kinesis in AWS us-east-1Sep 15, 2026, 18:5729h 46mCriticalBug
TwilioRetroactive Incident: Twilio Personalized Support Phone Line AffectedSep 3, 2026, 18:200mInformationalBug
Grafana LabsAlerting expressions pipeline failing when recovery settingsAug 8, 2026, 19:480mMinorBug
GitHubIncident with ActionsAug 6, 2026, 15:2210h 42mCriticalBug
Box[Medium] Issues with Box HubsJul 23, 2026, 14:1416mMajorBug
GitHubIncident With WebhooksJun 17, 2026, 19:000mInformationalBug
GitHubWebhook APIs and UI DegradedMay 28, 2026, 01:1319mMinorBug
UpstashFly.io Upstash Redis service distruption (FRA region)May 11, 2026, 15:053h 17mMajorBug
UpstashQStash US Region Service DisruptionMay 8, 2026, 09:4622mCriticalBug
ExpoUsers unable to authenticate with Expo Go (404)Apr 30, 2026, 20:130mMinorBug
GitHubDisruption with some GitHub servicesApr 28, 2026, 13:593h 10mMinorBug
GitHubIncident with Pull RequestsApr 23, 2026, 19:501h 53mMinorBug
SentrySSO login broken with Chromium browserApr 13, 2026, 20:311h 21mInformationalBug
GitHubIncident with Pull RequestsFeb 6, 2026, 17:4947mMinorBug
GitHubDisruption with some GitHub servicesJan 16, 2026, 23:533h 1mMinorBug
GitHubDisruption with some GitHub servicesJan 12, 2026, 10:0215mMajorBug
TwilioSubset of Inbound Calls With Invalid ST/SH Passports Being RejectedDec 11, 2025, 20:490mInformationalBug
VercelRuntime logs not showing in DashboardNov 14, 2025, 18:500mInformationalBug
AnthropicThree infrastructure bugs intermittently degrade Claude responsesAug 5, 2025, 00:0044dMajorBug
AirtableSome jira sync are only pulling in 100 rows of dataMar 11, 2025, 23:5927h 18mMinorBug
FastlyCustomer configuration triggers latent bug, 85% of network errorsJun 8, 2021, 09:472h 48mCriticalBug

Questions

How common are outages caused by software bug?

18 incidents in the last 12 months across the vendors tracked here were traced to software bug in the vendors' own words.

How is this cause identified?

From the sentences where the vendor explains why the incident happened, or by hand for landmark postmortems. Symptoms like "elevated error rates" are never counted as a cause.

From vendors' own status pages and disclosures. Times as reported. Logos via logo.dev; trademarks belong to their owners.