kezhenxu94 commented on issue #6901:
URL: https://github.com/apache/skywalking/issues/6901#issuecomment-839841521
> The config file would look like this:
>
> ```yaml
> serviceName:
${LABELS."service.istio.io/canonical-name"},${LABELS."app.kubernetes.io/name"},${LABELS."app"}
> serviceInstanceName: ${NAME}
> ```
>
> This is just a suggestion, any other implementation covering the
requirement is welcome.
Instead of `${a},${b},${c}`, I used `${a,b,c}` in #6933 , so something like
`prefix::${a,b,c}::suffix` will work if `a` is empty but `b` is not (say
`test`), it evaluates as `prefix::test::suffix`, using `${a},${b},${c}` will
need to duplicate the prefixes and suffixes like `prefix::${a}::suffix`,
`prefix::${b}::suffix`, `prefix::${c}::suffix`, and the empty check is even
complicated since `a == null` evaluates `prefix::${a}::suffix` as
`prefix::null::suffix`
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