Apache Tomcat 指标监控

DeepSeek V3 中英对照 Tomcat Apache Tomcat Metrics Instrumentation

Apache Tomcat 软件是 Jakarta Servlet、Jakarta Server Pages、Jakarta Expression Language、Jakarta WebSocket、Jakarta Annotations 和 Jakarta Authentication 规范的开源实现。

// Setting up instrumentation
SimpleMeterRegistry registry = new SimpleMeterRegistry(SimpleConfig.DEFAULT, new MockClock());

Iterable<Tag> tags = Tags.of("metricTag", "val1");
TomcatMetrics.monitor(registry, manager, tags);

// Example of Tomcat metrics
assertThat(registry.get("tomcat.sessions.active.max").tags(tags).gauge().value()).isEqualTo(3.0);
assertThat(registry.get("tomcat.sessions.active.current").tags(tags).gauge().value()).isEqualTo(2.0);
assertThat(registry.get("tomcat.sessions.expired").tags(tags).functionCounter().count()).isEqualTo(1.0);
assertThat(registry.get("tomcat.sessions.rejected").tags(tags).functionCounter().count()).isEqualTo(1.0);
assertThat(registry.get("tomcat.sessions.created").tags(tags).functionCounter().count()).isEqualTo(3.0);
assertThat(registry.get("tomcat.sessions.alive.max").tags(tags).timeGauge().value()).isGreaterThan(1.0);

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