There is no liveness health check for the instance. Only applicable for instances in App Engine standard environment.
UNKNOWN
The health checking system is aware of the instance but its health is not known at the moment.
HEALTHY
The instance is reachable i.e. a connection to the application health checking endpoint can be established, and conforms to the requirements defined by the health check.
UNHEALTHY
The instance is reachable, but does not conform to the requirements defined by the health check.
DRAINING
The instance is being drained. The existing connections to the instance have time to complete, but the new ones are being refused.
TIMEOUT
The instance is unreachable i.e. a connection to the application health checking endpoint cannot be established, or the server does not respond within the specified timeout.
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Missing the information I need","missingTheInformationINeed","thumb-down"],["Too complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-07-02 UTC."],[],[]]
