Health Evaluation

All checks expose a health stats of passing (Green) or failing (Red). For example the HTTP check fails if the status is 200 >= code < 299 these default behaviors can be changed using the test field:

In the example below the http check fails if the HTTP response header contains an 'Authorization' field.

apiVersion: canaries.flanksource.com/v1
kind: Canary
metadata:
  name: http-no-auth
spec:
  http:
    - name: http-no-auth
      url: https://httpbin.demo.aws.flanksource.com/headers
      test:
        expr: "! ('Authorization' in json.headers.keys())"

Boolean

test expressions must return a bool or boolean type string ('true' or 'false')

See Cel Expressions for a function reference

Javascript and Go Templating

While test fields do support Javascript and Go Templates, they are not recommended for health evaluations due to their verbosity and performance.

Variables

Each check exposes different variables to use in the display expression, See the Result Variables section for each check.

Variables​

Variables