The instance is being drained. The existing connections to the instance
have time to complete, but the new ones are being refused.
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.
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.
Unhealthy
The instance is reachable, but does not conform to the requirements
defined by the health check.
Unknown
The health checking system is aware of the instance but its health is
not known at the moment.
Unspecified
There is no liveness health check for the instance. Only applicable for
instances in App Engine standard environment.
[[["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complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-07 UTC."],[[["\u003cp\u003eThis webpage details the \u003ccode\u003eLivenessState\u003c/code\u003e enum, which describes the health status of Google Cloud App Engine Flex instances.\u003c/p\u003e\n"],["\u003cp\u003eThe latest version of the \u003ccode\u003eLivenessState\u003c/code\u003e reference is 2.4.0, with versions back to 1.0.0 also available via linked documentation.\u003c/p\u003e\n"],["\u003cp\u003eThe available health statuses for instances, as defined by the \u003ccode\u003eLivenessState\u003c/code\u003e enum, include \u003ccode\u003eDraining\u003c/code\u003e, \u003ccode\u003eHealthy\u003c/code\u003e, \u003ccode\u003eTimeout\u003c/code\u003e, \u003ccode\u003eUnhealthy\u003c/code\u003e, \u003ccode\u003eUnknown\u003c/code\u003e, and \u003ccode\u003eUnspecified\u003c/code\u003e.\u003c/p\u003e\n"],["\u003cp\u003eThe \u003ccode\u003eUnspecified\u003c/code\u003e health status is unique, as it applies only to instances within the App Engine standard environment, indicating a lack of liveness health checks.\u003c/p\u003e\n"]]],[],null,[]]
