红帽全球峰会220.11. Metric type meter
metrics:gauge:metricname[?options]
metrics:gauge:metricname[?options]220.11.1. 选项
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| 名称 | default | 描述 |
|---|---|---|
| subject | - | 通过量表观察到的任何对象 |
如果没有定义 主题，它只是忽略的，即没有注册量表。
// update gauge "simple.gauge" by a bean "mySubjectBean"
from("direct:in")
.to("metrics:gauge:simple.gauge?subject=#mySubjectBean")
.to("direct:out");
// update gauge "simple.gauge" by a bean "mySubjectBean"
from("direct:in")
.to("metrics:gauge:simple.gauge?subject=#mySubjectBean")
.to("direct:out");220.11.2. Headers
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消息标头可用于覆盖指标组件 URI 中指定的 主题 值。注：如果指定了 CamelMetricsName 标头，那么除了 URI 中指定的默认量外，还会注册新的量表。
| 名称 | 描述 | 预期类型 |
|---|---|---|
| CamelMetricsGaugeSubject | 覆盖 URI 中的主题值 | 对象 |
// update gauge simple.gauge by a String literal "myUpdatedSubject"
from("direct:in")
.setHeader(MetricsConstants.HEADER_GAUGE_SUBJECT, constant("myUpdatedSubject"))
.to("metrics:counter:simple.gauge?subject=#mySubjectBean")
.to("direct:out");
// update gauge simple.gauge by a String literal "myUpdatedSubject"
from("direct:in")
.setHeader(MetricsConstants.HEADER_GAUGE_SUBJECT, constant("myUpdatedSubject"))
.to("metrics:counter:simple.gauge?subject=#mySubjectBean")
.to("direct:out");
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