Required. Standard field mask for the set of fields to be updated.
This is a comma-separated list of fully qualified names of fields. Example: "user.displayName,photo".
migrateTraffic
boolean
Set to true to gradually shift traffic to one or more versions that you specify. By default, traffic is shifted immediately. For gradual traffic migration, the target versions must be located within instances that are configured for both warmup requests and automatic scaling. You must specify the shardBy field in the Service resource. Gradual traffic migration is not supported in the App Engine flexible environment. For examples, see Migrating and Splitting Traffic.
[[["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 2025-06-16 UTC."],[[["\u003cp\u003eThis page details how to update the configuration of a specified service using a PATCH request to the \u003ccode\u003ehttps://appengine.googleapis.com/v1beta/{name=apps/*/services/*}\u003c/code\u003e endpoint.\u003c/p\u003e\n"],["\u003cp\u003eThe update operation requires specifying the \u003ccode\u003ename\u003c/code\u003e path parameter, which indicates the resource to be updated, and the authorization to do so requires the \u003ccode\u003eappengine.services.update\u003c/code\u003e IAM permission.\u003c/p\u003e\n"],["\u003cp\u003eThe \u003ccode\u003eupdateMask\u003c/code\u003e query parameter is mandatory, and it dictates which fields of the service are to be updated, using a comma-separated list of fully qualified names.\u003c/p\u003e\n"],["\u003cp\u003eOptional traffic migration can be performed by using the \u003ccode\u003emigrateTraffic\u003c/code\u003e query parameter, allowing for a gradual shift of traffic to new versions; this parameter is not supported in the App Engine flexible environment.\u003c/p\u003e\n"],["\u003cp\u003eThe request body must be a \u003ccode\u003eService\u003c/code\u003e instance, while a successful response will contain an \u003ccode\u003eOperation\u003c/code\u003e instance.\u003c/p\u003e\n"]]],[],null,[]]
