str
Optional. Identifier of the conversation. Generally it's
auto generated by Google. Only set it if you cannot wait for
the response to return a auto-generated one to you.
The conversation ID must be compliant with the regression
formula ``a-zA-Z][a-zA-Z0-9_-]*`` with the characters
length in range of [3,64]. If the field is provided, the
caller is responsible for
1. the uniqueness of the ID, otherwise the request will be
rejected.
2. the consistency for whether to use custom ID or not under
a project to better ensure uniqueness.
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Hard to understand","hardToUnderstand","thumb-down"],["Incorrect information or sample code","incorrectInformationOrSampleCode","thumb-down"],["Missing the information/samples I need","missingTheInformationSamplesINeed","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2026-03-31 UTC."],[],[]]