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Explanation of Terms pertaining to SLAs within the AA Ecosystem
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TermExplanation
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Service Success RateThe term "Service" refers to an API offered by an API provider, in the AA network, or a function (such as a notification) implemented by any AA participant.

Service Success Rate % = daily percentage of API requests or API call-backs that do not fail with errors, excluding failure owing to planned down-time

A "request / call-back not failing with error" implies it meets its intended functionaliy.

The following situations represent the service not failing.

a. Where the http response code is 200 AND there is no "bad payload", e.g. if there is gibberish in the response although the http status code says 200, the service is considered "down".

b. Where the http response code is 4XX implying there is an error on the API client side.

c. Where the callback payload indicates an "FI Status" other than "Timeout". (Relevant for FIP callbacks to AAs and AA callbacks to FIUs)

The following situations represent the service failing.

a. Where the http response code is 200 but there is "bad payload"

b. Where the http response code is 5XX

c. Where there is no response from the API (i.e. the wait time for the API client exceeds the P100 response time SLA)

d. Where the callback payload indicates an "FI Status" of "Timeout.
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Error Response RateThe percentage of API requests or API Callbacks that "fail" as per the definition mentioned above.

Error Response Rate % = 100 - Service Availability %
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Response TimeTime in milliseconds for an API response or an API callback, by an API provider:

P95 latency: The worst response time experienced by 95% of API requestors or callback recipients.

P100 latency: The maximum response time that API requestors or callback recipients expect API providers to take, beyond which the API provider is deemed to have "failed".

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Up TimeSLA level of 99.5 % uptime/availability results in the following periods of allowed downtime/unavailability (https://uptime.is/99.5):

Daily: 7m 12s
Weekly: 50m 24s
Monthly: 3h 37m 21s
Quarterly: 10h 52m 2.2s
Yearly: 1d 19h 28m 8.8s
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