API Directory Terms
95th Percentile
The latency of the slowest 5% of calls expressed in milliseconds.
99th Percentile
The latency of the slowest 1% of calls expressed in milliseconds.
AWS
Amazon Web Services – observer agents running on AWS servers in different regions.
Azure
Azure from Microsoft – observer agents running on Microsoft servers in different regions.
Cloud Provider
The third-party cloud host where our observer agent is based.
DNS Lookup Time
The time the cloud provider Domain Name Service (DNS) host takes to resolve the URI for the API.
Download Time
How long it takes the target server and the internet to transfer data to our cloud observer agent.
Google Cloud – observer agents running on Google servers in different regions.
IBM
IBM Cloud – observer agents running on IBM servers in different regions.
Median Total Time
The median latency of calls from our observer agents from the point at which the call is initiated to the point at which the last byte is received expressed in milliseconds (1/1000s of a second).
Outliers
The percentage of calls over time that were decided to be a performance outlier by our AI.
Pass Rate
The % of calls in the given time that passed with either just a HTTP200 code (link) or met the criteria set in APImetrics for a successful pass.
Processing Time
How long the target server takes to handle the API call.
Quality
Cloud API Service Consistency (CASC) is an APIContext-proprietary patented technology that combines various measures of API performance such as availability, latency, reliability, and number of outliers, benchmarked against our unrivaled collection of historical API call records, to give a single blended metric much like a credit rating. The CASC score lets you see at a glance the quality of an API endpoint, whether it is getting better or worse, and how it compares to other endpoints.
| CASC Score Zone | CASC Score Range | API Status |
|---|---|---|
Green |
8.00 or greater | API is performing well with no performance issues |
Yellow |
6.00 - 7.99 | API is generally performing adequately, but there are some performance issues in need of attention |
Red |
Less than 6.00 | API is peforming poorly. There are serious performance issues in need of urgent remedial attention |
Region
The global region where the call originates.
SSL Handshake Time
The time taken for the Secure Sockets Layer (SSL) handshake to take place.
TCP Connect Time
The time it takes for Transmission Control Protocol (TCP), or for the observer agent to connect to the server hosting the API.
Total Time
The total time an API call takes from our observer agent placing the call to the last byte being received.
Upload Time
How long the observer agent takes to upload the parameters of the call to the target server.
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