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Merge develop into main for documentation (#143)

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Thomas Gruber
2025-04-17 11:37:47 +02:00
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internal/metricAggregator/README.md
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<!--
---
title: Metric Aggregator
description: Subsystem for evaluating expressions on metrics (deprecated)
categories: [cc-metric-collector]
tags: ['Developer']
weight: 1
hugo_path: docs/reference/cc-metric-collector/internal/metricaggregator/_index.md
---
-->
# The MetricAggregator
In some cases, further combination of metrics or raw values is required. For that strings like `foo + 1` with runtime dependent `foo` need to be evaluated. The MetricAggregator relies on the [`gval`](https://github.com/PaesslerAG/gval) Golang package to perform all expression evaluation. The `gval` package provides the basic arithmetic operations but the MetricAggregator defines additional ones.
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## Limitations
- Since the metrics are written in JSON files which do not allow `""` without proper escaping inside of JSON strings, you have to use `''` for strings.
- Since `\` is interpreted by JSON as escape character, it cannot be used in metrics. But it is required to write regular expressions. So instead of `/`, use `%` and the MetricAggregator replaces them after reading the JSON file.
- Since `\` is interpreted by JSON as escape character, it cannot be used in metrics. But it is required to write regular expressions. So instead of `/`, use `%` and the MetricAggregator replaces them after reading the JSON file.