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PagerDuty is the incident response and on-call platform that UK DevOps teams rely on when things break. It aggregates alerts from monitoring tools, routes them to the right person, and escalates automatically until someone acknowledges. On-call scheduling, incident timelines, and post-incident reviews are built in. The free plan covers limited on-call and alerting; paid tiers start at $14/user/month. GDPR compliant with EU data residency, PagerDuty integrates with Datadog, Sentry, and AWS. For UK startups that need dependable incident response, it's the industry standard.