# Uptime

Concept · [Cloud, hosting and security](https://ecosystem.samcarlton.com/cloud)

Also called: downtime, outage, outages, SLA, service level agreement, availability, status page

The share of time a service is working and reachable. Providers often promise a level of uptime in a service level agreement, or SLA, and usually owe a credit on the bill when they miss it. [Common Paper](https://ecosystem.samcarlton.com/common-paper) publishes a free, standard template for an SLA (Service Level Agreement).

**For example:** An SLA [promises](https://ecosystem.samcarlton.com/promise-chain) 99.9 percent uptime each month. In a 30-day month that allows about 43 minutes of downtime.

## Connects to (8)

- [Hosting](https://ecosystem.samcarlton.com/hosting): Renting space on a server so your site or app can be reached on the internet at all hours.
- [Cloud provider](https://ecosystem.samcarlton.com/cloud-provider): A company that rents out computing services, such as servers, storage and databases, over the internet and on demand.
- [Backup](https://ecosystem.samcarlton.com/backup): A copy of data kept so it can be recovered if the original is lost or damaged.
- [Managed service](https://ecosystem.samcarlton.com/managed-service): A service where the provider handles the upkeep instead of the customer's own team.
- [Common Paper](https://ecosystem.samcarlton.com/common-paper): A contract company for startups that publishes free, standard agreements anyone may use and modify, along with software for sending…
- [Graceful degradation](https://ecosystem.samcarlton.com/graceful-degradation): Designing a system so that when one part fails, the rest keeps working in a simpler way instead of breaking completely.
- [Observability](https://ecosystem.samcarlton.com/observability): Being able to see what a running system is doing through its logs, metrics and traces, so a team can tell when something goes wrong and why.
- [Cloud service agreement](https://ecosystem.samcarlton.com/cloud-service-agreement): A contract between a company that sells cloud software and a business that buys it.

Map view: https://ecosystem.samcarlton.com/uptime