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Adding documentation about special regex match group

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Signed-off-by: Pedro Tanaka <pedro.stanaka@gmail.com>
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Pedro Tanaka 2022-06-29 10:14:56 +02:00
parent 848212e028
commit f935a9c869
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README.md
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@ -317,6 +317,25 @@ mappings:
provider: "$1"
```
#### Special match groups
When using regex, the match group `0` is the full match and can be used to attach labels to the metric.
Example:
```yaml
mappings:
- match: ".+"
match_type: regex
name: "$0"
labels:
statsd_metric_name: "$0"
```
If a metric `my.statsd_counter` is received, the metric name will **still** be mapped to `my_statsd_counter` (Prometheus compatible name).
But the metric will also have the label `statsd_metric_name` with the value `my.statsd_counter` (unchanged value).
The same is not achievable with glob matching, for more details check [this issue](https://github.com/prometheus/statsd_exporter/issues/438).
### Naming, labels, and help
Please note that metrics with the same name must also have the same set of