xds: Fail RPCs with error details when resources are deleted #9337
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Previously if LDS/RDS were missing or improperly configured RPCs would
fail with "UNAVAILABLE: NameResolver returned no usable address errors".
That is very confusing and not helpful for debugging.
Ideally we'd also include the node id in this error message, but that's
a bit more involved and this is a huge improvement even without it.
b/237539851