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📝 adjust metric description wording #103

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📝 adjust metric description wording #103

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2 changes: 1 addition & 1 deletion promql/what-is-prometheus-metrics-and-labels.md
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Expand Up @@ -57,7 +57,7 @@ http_request_total{status="200", method="POST"}@1434417561287 => 4785

标签(label)反映了当前样本的特征维度，通过这些维度Prometheus可以对样本数据进行过滤，聚合等。标签的名称只能由ASCII字符、数字以及下划线组成并满足正则表达式```[a-zA-Z_][a-zA-Z0-9_]*```。

其中以`__`作为前缀的标签，是系统保留的关键字，只能在系统内部使用。标签的值则可以包含任何Unicode编码的字符。在Prometheus的底层实现中指标名称实际上是以`__name__=<metric name>`的形式保存在数据库中的，因此以下两种方式均表示的同一条time-series：
其中以`__`作为前缀的标签，是系统保留的关键字，只能在系统内部使用。标签的值则可以包含任何Unicode编码的字符。在Prometheus的底层实现中指标名称实际上是以`__name__=<metric name>`的形式保存在数据库中的，因此以下两种方式均表示的同一个metric：

```
api_http_requests_total{method="POST", handler="/messages"}
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