Amnon Heiman 123dd44c21 api: Add the metrics API ...

This patch adds a metrics API implementation.
The API supports get and set the metric relabel config.

Seastar supports metrics relabeling in runtime, following Prometheus
relabel_config.

Based on metrics and label name, a user can add or remove labels,
disable a metric and set the skip_when_empty flag.

The metrics-config API support such configuration to be done using the
RestFull API.

As it's a new API it is placed under the V2 path.

After this patch the following API will be available
'http://localhost:10000/v2/metrics-config/' GET/POST.

For example:
To get the current config:
```
curl -X GET --header 'Accept: application/json' 'http://localhost:10000/v2/metrics-config/'
```

To set a config:
```
curl -X POST --header 'Content-Type: application/json' --header 'Accept: application/json' -d '[ \
   { \
     "source_labels": [ \
       "__name__" \
     ], \
     "action": "replace", \
     "target_label": "level", \
     "replacement": "1", \
     "regex": "io_que.*" \
   } \
 ]' 'http://localhost:10000/v2/metrics-config/'
```

2023-07-17 17:09:36 +03:00

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