grpc-js: Pass channel args to LB policies with updates #2854
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This removes the channel options argument from the
LoadBalancer
constructor and adds it to theupdateAddressList
method, replacing theattributes
argument. Resolver attributes are now added to channel options, as are any other values that need to be passed between LB policies but don't go in the LB policy config. Channel options that start with the string defined inSUBCHANNEL_ARGS_EXCLUDE_KEY_PREFIX
will not be passed to subchannel constructors or used to determine subchannel uniqueness.