219.11. 지표 유형 게이지

// 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 String literal "myUpdatedSubject"
from("direct:in")
    .setHeader(MetricsConstants.HEADER_GAUGE_SUBJECT, constant("myUpdatedSubject"))
    .to("metrics:counter:simple.gauge?subject=#mySubjectBean")
    .to("direct:out");