/actuator/prometheus
tomcat 相关指标 tomcat_开头
没有的话，检查下 是否被 exclude 了

@EnableAutoConfiguration(exclude = {DataSourceAutoConfiguration.class, WebMvcMetricsAutoConfiguration.class})
TomcatMetricsAutoConfiguration
org.springframework.boot.actuate.autoconfigure.metrics.web.tomcat.TomcatMetricsAutoConfiguration


tomcat_threads_current{name="http-nio-8110",} 136.0
tomcat_threads_busy{name="http-nio-8110",} 3.0
tomcat_threads_config_max{name="http-nio-8110",} 300.0


tomcat_global_error_total{name="http-nio-8110",} 113638.0
tomcat_global_request_seconds_count{name="http-nio-8110",} 136203.0
tomcat_global_request_seconds_sum{name="http-nio-8110",} 519.194
tomcat_global_request_max_seconds{name="http-nio-8110",} 0.721
tomcat_global_sent_bytes_total{name="http-nio-8110",} 2.19610485E8