SLA and uptime tracking in Rest API - Cheat Sheet & Quick Revision

Recall & Review

beginner

What does SLA stand for in service management?

SLA stands for Service Level Agreement. It is a contract that defines the expected level of service between a provider and a customer.

beginner

Why is uptime important in SLA tracking?

Uptime measures the time a service is available and working. High uptime means the service is reliable and meets SLA promises.

intermediate

How is uptime percentage calculated?

Uptime % = (Total time service is available / Total time in period) × 100. For example, 99.9% uptime means the service was down for only 0.1% of the time.

beginner

What is a common REST API endpoint to check service uptime?

A common endpoint is GET /health or GET /status which returns the current status and uptime info of the service.

intermediate

How can you track SLA violations using a REST API?

You can track SLA violations by regularly calling uptime/status endpoints, logging downtime events, and comparing uptime against SLA targets.

What does a 99.9% uptime SLA mean?

A The service can be down for about 8.76 hours per year

B The service is down 99.9% of the time

C The service is always available

D The service is down for 99.9 hours per month

99.9% uptime means the service can be down for about 0.1% of the time, which is roughly 8.76 hours per year.

Which HTTP method is usually used to check service status in a REST API?

A POST

B GET

C PUT

D DELETE

GET is used to retrieve information like service status without changing any data.

What is the main purpose of an SLA?

A To create marketing materials

B To write code for the service

C To design the user interface

D To define service expectations and responsibilities

An SLA defines the expected service levels and responsibilities between provider and customer.

Which metric directly measures service availability?

A Memory usage

B Response time

C Uptime

D CPU usage

Uptime measures how long the service is available and working.

How can downtime be detected via a REST API?

A By receiving error responses or no response from status endpoints

B By sending POST requests to update data

C By checking user login times

D By monitoring database size

Downtime is detected when status endpoints return errors or fail to respond.

Explain what SLA and uptime tracking mean and why they are important for a service.

Think about promises made to customers and how we check if they are kept.

Describe how you would use a REST API to monitor a service's uptime and detect SLA violations.

Consider how to check service health regularly and measure against agreed levels.