Cloud Service Models - Full SRE Lecture: IaaS, PaaS, SaaS

The provided document outlines the responsibilities, incident handling procedures, and Service Level Objectives (SLOs) for Infrastructure as a Service (IaaS), Platform as a Service (PaaS), and Software as a Service (SaaS). Here's a summary of each section:

Responsibilities by Model

IaaS:

• Responsibilities: Full control over the infrastructure. You define service levels, manage availability, and handle all aspects of monitoring.
• Metrics & Monitoring: Custom metrics from your application and infrastructure.
• Error Budgets: Fully owned and managed.

PaaS:

• Responsibilities: Platform provides some built-in services, but you still need to manage application-specific issues. You must understand the platform's limitations.
• Metrics & Monitoring: A mix of platform-provided metrics and custom application metrics.
• Error Budgets: Limited by the platform’s Service Level Agreement (SLA), meaning any downtime or performance issues from the platform affect your error budget.

SaaS:

• Responsibilities: Mainly observe and react to service outages. You rely heavily on the vendor's uptime guarantees.
• Metrics & Monitoring: Typically API response times, login success rates, etc., provided by the vendor.

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