Service Level Availability (SLA) is the percentage of time during which the platform is in an available state. Other states are degraded and outage.
Each of the user facing services have two Service Level Indicators (SLI): the uptime, and the error rate. The Uptime score is generally a measure of the service performance (latency). The Error rate measures the percentage of requests that fail due to an error (usually, a 5XX status code).
A service is considered available when:
An example of available web service; within a 5 minute period:
In other words, a service needs to simultaneously meet both of its SLO targets in order to be considered available. If either target is not met, the service is considered unavailable.
The availability score for a service is then calculated as the percentage of time that it is available. The Availability score for each service combined define the platform Service Level Availability (SLA). The SLA number indicates availability of Billit.eu for a select period of time.
For example, if service becomes unavailable for a 10 minute period, the availability score will be:
The SLA score can be seen on the SLA dashboard, and the SLA target is set as an Infrastructure key performance indicator for the API (api.billit.be), Login (my.billit.be) and Application (my.billit.be)
Billit guarantees 99.9% uptime, however our internal target is 100%
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