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dataclients/kubernetes: add metadata route - zone aware option 2 #2845

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dataclients/kubernetes: add metadata route - zone aware option 2 #2845

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Commits on Jan 17, 2024

  1. dataclients/kubernetes: add metadata route 

    Adds a special route with a predefined id `kube__metadata`
that contains `False` predicate, no filters and endpoints metadata.

Endpoints metadata is encoded as JSON via [data URI scheme](https://en.wikipedia.org/wiki/Data_URI_scheme)
into the route backend address field.

Example eskip:
```
kube__metadata: False() -> "data:application/json;base64,eyJhZGRyZXNzZXMiO...";
...
```

A special route pre-processor detects and removes this route, decodes metadata
and stores it as EndpointRegistry metrics.

The endpoint metrics then used to obtain endpoint node and pod names
for tracing and logging.

TODO:
- [ ] add flag  to enable metadata route
- [ ] tests

Fixes #1559

Signed-off-by: Alexander Yastrebov <[email protected]>
    @AlexanderYastrebov
    AlexanderYastrebov committed Jan 17, 2024
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