A NackHandler handles when nack() is called in a user's AckReplyConsumer. Pub/Sub Lite does not
have a concept of 'nack'. When nack() is called in an AckReplyConsumerr, nack(message) is called
with the nacked message.
If the returned future is successful, the message is acknowledged. If the future fails, the
subscriber client will be failed. The default behavior is to immediately fail the client.
[[["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complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-07 UTC."],[],[]]
