ClusterCockpit/cc-metric-collector
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Add order of operations in router to README

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Thomas Roehl 2022-05-04 14:32:07 +02:00
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internal/metricRouter/README.md
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@ -174,6 +174,7 @@ This option takes a list of evaluable conditions and performs them one after the
```
The first line is comparable with the example in `drop_metrics`, it drops all metrics starting with `drop_metric_` and ending with a number. The second line drops all metrics of the first hardware thread (**not** recommended)
# Manipulating the metric units
## The `normalize_units` option
The cc-metric-collector tries to read the data from the system as it is reported. If available, it tries to read the metric unit from the system as well (e.g. from `/proc/meminfo`). The problem is that, depending on the source, the metric units are named differently. Just think about `byte`, `Byte`, `B`, `bytes`, ...
@ -228,3 +229,22 @@ Use cases for `interval_aggregates`:
}
}
```
# Order of operations
The router performs the above mentioned options in a specific order. In order to get the logic you want for a specific metric, it is crucial to know the processing order:
- Add the `hostname` tag (c)
- Manipulate the timestamp to the interval timestamp (c,r)
- Drop metrics based on `drop_metrics` and `drop_metrics_if` (c,r)
- Add tags based on `add_tags` (c,r)
- Delete tags based on `del_tags` (c,r)
- Rename metric based on `rename_metric` (c,r)
- Add tags based on `add_tags` to still work if the configuration uses the new name (c,r)
- Delete tags based on `del_tags` to still work if the configuration uses the new name (c,r)
- Normalize units when `normalize_units` is set (c,r)
- Convert unit prefix based on `change_unit_prefix` (c,r)
Legend:
- 'c' if metric is coming from a collector
- 'r' if metric is coming from a receiver