tokers commented on issue #4527:
URL: https://github.com/apache/apisix/issues/4527#issuecomment-873869125
@zuiyangqingzhou There is a useful trick that can used to implement the
configuration grayscale, Apache APISIX supports configuring a Route object with
route match expressions (the `vars` field in Route), you may add an expression
to specify the set of APISIX instances that will use the route.
```json
{
"vars": [
["server_addr", "==", "172.17.13.3"]
]
}
```
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