虽然prometheus客户端内有自己的http服务，但一般来说，很少为了prometheus这个特性来新增一个端口或者是web server来处理prometheus的接口。刚好我们有个需求要在springboot之上累加一下prometheus监控的能力。本文讲解一下如何在SpringBoot的基础上累加prometheus的监控
1.添加依赖
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
<version>2.3.4.RELEASE</version>
</dependency>
<!-- https://mvnrepository.com/artifact/io.micrometer/micrometer-registry-prometheus -->
<dependency>
<groupId>io.micrometer</groupId>
<artifactId>micrometer-core</artifactId>
<version>1.6.4</version>
</dependency>
<dependency>
<groupId>io.micrometer</groupId>
<artifactId>micrometer-registry-prometheus</artifactId>
<version>1.6.4</version>
</dependency>
2.在ApplicationYaml中配置开启promethues
management:
endpoints:
web:
exposure:
include: [prometheus]
这个时候，开启程序，访问/actuator/prometheus 接口就已经可以访问到符合prometheus格式的数据了
curl 127.0.0.1:8080/actuator/prometheus -iv
* Trying 127.0.0.1...
* TCP_NODELAY set
* Connected to 127.0.0.1 (127.0.0.1) port 8080 (#0)
> GET /actuator/prometheus HTTP/1.1
> Host: 127.0.0.1:8080
> User-Agent: curl/7.64.1
> Accept: */*
>
< HTTP/1.1 200
HTTP/1.1 200
< Content-Type: text/plain; version=0.0.4;charset=utf-8
Content-Type: text/plain; version=0.0.4;charset=utf-8
< Content-Length: 7611
Content-Length: 7611
< Date: Sun, 21 Feb 2021 13:30:14 GMT
Date: Sun, 21 Feb 2021 13:30:14 GMT
<
# HELP tomcat_sessions_expired_sessions_total
# TYPE tomcat_sessions_expired_sessions_total counter
tomcat_sessions_expired_sessions_total 0.0
# HELP jvm_gc_max_data_size_bytes Max size of long-lived heap memory pool
# TYPE jvm_gc_max_data_size_bytes gauge
jvm_gc_max_data_size_bytes 2.863661056E9
# HELP process_uptime_seconds The uptime of the Java virtual machine
# TYPE process_uptime_seconds gauge
process_uptime_seconds 4.142
# HELP jvm_buffer_total_capacity_bytes An estimate of the total capacity of the buffers in this pool
# TYPE jvm_buffer_total_capacity_bytes gauge
jvm_buffer_total_capacity_bytes{id="direct",} 8192.0
jvm_buffer_total_capacity_bytes{id="mapped",} 0.0
# HELP tomcat_sessions_rejected_sessions_total
# TYPE tomcat_sessions_rejected_sessions_total counter
tomcat_sessions_rejected_sessions_total 0.0
# HELP process_files_open_files The open file descriptor count
# TYPE process_files_open_files gauge
process_files_open_files 110.0
# HELP jvm_threads_peak_threads The peak live thread count since the Java virtual machine started or peak was reset
# TYPE jvm_threads_peak_threads gauge
jvm_threads_peak_threads 22.0
# HELP jvm_threads_states_threads The current number of threads having NEW state
# TYPE jvm_threads_states_threads gauge
jvm_threads_states_threads{state="runnable",} 8.0
jvm_threads_states_threads{state="blocked",} 0.0
jvm_threads_states_threads{state="waiting",} 12.0
jvm_threads_states_threads{state="timed-waiting",} 2.0
jvm_threads_states_threads{state="new",} 0.0
jvm_threads_states_threads{state="terminated",} 0.0
# HELP logback_events_total Number of error level events that made it to the logs
# TYPE logback_events_total counter
logback_events_total{level="warn",} 0.0
logback_events_total{level="debug",} 0.0
logback_events_total{level="error",} 0.0
logback_events_total{level="trace",} 0.0
logback_events_total{level="info",} 7.0
# HELP jvm_classes_unloaded_classes_total The total number of classes unloaded since the Java virtual machine has started execution
# TYPE jvm_classes_unloaded_classes_total counter
jvm_classes_unloaded_classes_total 0.0
# HELP jvm_gc_pause_seconds Time spent in GC pause
# TYPE jvm_gc_pause_seconds summary
jvm_gc_pause_seconds_count{action="end of major GC",cause="Metadata GC Threshold",} 1.0
jvm_gc_pause_seconds_sum{action="end of major GC",cause="Metadata GC Threshold",} 0.049
jvm_gc_pause_seconds_count{action="end of minor GC",cause="Metadata GC Threshold",} 1.0
jvm_gc_pause_seconds_sum{action="end of minor GC",cause="Metadata GC Threshold",} 0.007
# HELP jvm_gc_pause_seconds_max Time spent in GC pause
# TYPE jvm_gc_pause_seconds_max gauge
jvm_gc_pause_seconds_max{action="end of major GC",cause="Metadata GC Threshold",} 0.049
jvm_gc_pause_seconds_max{action="end of minor GC",cause="Metadata GC Threshold",} 0.007
# HELP jvm_memory_committed_bytes The amount of memory in bytes that is committed for the Java virtual machine to use
# TYPE jvm_memory_committed_bytes gauge
jvm_memory_committed_bytes{area="heap",id="PS Survivor Space",} 1.1010048E7
jvm_memory_committed_bytes{area="heap",id="PS Old Gen",} 1.75112192E8
jvm_memory_committed_bytes{area="heap",id="PS Eden Space",} 1.30547712E8
jvm_memory_committed_bytes{area="nonheap",id="Metaspace",} 3.7838848E7
jvm_memory_committed_bytes{area="nonheap",id="Code Cache",} 1.5204352E7
jvm_memory_committed_bytes{area="nonheap",id="Compressed Class Space",} 5111808.0
# HELP jvm_buffer_count_buffers An estimate of the number of buffers in the pool
# TYPE jvm_buffer_count_buffers gauge
jvm_buffer_count_buffers{id="direct",} 1.0
jvm_buffer_count_buffers{id="mapped",} 0.0
# HELP tomcat_sessions_alive_max_seconds
# TYPE tomcat_sessions_alive_max_seconds gauge
tomcat_sessions_alive_max_seconds 0.0
# HELP process_cpu_usage The "recent cpu usage" for the Java Virtual Machine process
# TYPE process_cpu_usage gauge
process_cpu_usage 0.0
# HELP tomcat_sessions_active_max_sessions
# TYPE tomcat_sessions_active_max_sessions gauge
tomcat_sessions_active_max_sessions 0.0
# HELP tomcat_sessions_active_current_sessions
# TYPE tomcat_sessions_active_current_sessions gauge
tomcat_sessions_active_current_sessions 0.0
# HELP jvm_gc_memory_promoted_bytes_total Count of positive increases in the size of the old generation memory pool before GC to after GC
# TYPE jvm_gc_memory_promoted_bytes_total counter
jvm_gc_memory_promoted_bytes_total 8422864.0
# HELP jvm_memory_used_bytes The amount of used memory
# TYPE jvm_memory_used_bytes gauge
jvm_memory_used_bytes{area="heap",id="PS Survivor Space",} 0.0
jvm_memory_used_bytes{area="heap",id="PS Old Gen",} 1.534216E7
jvm_memory_used_bytes{area="heap",id="PS Eden Space",} 1.2262736E7
jvm_memory_used_bytes{area="nonheap",id="Metaspace",} 3.5081712E7
jvm_memory_used_bytes{area="nonheap",id="Code Cache",} 1.5064128E7
jvm_memory_used_bytes{area="nonheap",id="Compressed Class Space",} 4586720.0
# HELP jvm_classes_loaded_classes The number of classes that are currently loaded in the Java virtual machine
# TYPE jvm_classes_loaded_classes gauge
jvm_classes_loaded_classes 6732.0
# HELP jvm_memory_max_bytes The maximum amount of memory in bytes that can be used for memory management
# TYPE jvm_memory_max_bytes gauge
jvm_memory_max_bytes{area="heap",id="PS Survivor Space",} 1.1010048E7
jvm_memory_max_bytes{area="heap",id="PS Old Gen",} 2.863661056E9
jvm_memory_max_bytes{area="heap",id="PS Eden Space",} 1.406664704E9
jvm_memory_max_bytes{area="nonheap",id="Metaspace",} -1.0
jvm_memory_max_bytes{area="nonheap",id="Code Cache",} 2.5165824E8
jvm_memory_max_bytes{area="nonheap",id="Compressed Class Space",} 1.073741824E9
# HELP jvm_gc_live_data_size_bytes Size of long-lived heap memory pool after reclamation
# TYPE jvm_gc_live_data_size_bytes gauge
jvm_gc_live_data_size_bytes 1.534216E7
# HELP system_cpu_count The number of processors available to the Java virtual machine
# TYPE system_cpu_count gauge
system_cpu_count 16.0
# HELP jvm_threads_live_threads The current number of live threads including both daemon and non-daemon threads
# TYPE jvm_threads_live_threads gauge
jvm_threads_live_threads 22.0
# HELP system_load_average_1m The sum of the number of runnable entities queued to available processors and the number of runnable entities running on the available processors averaged over a period of time
# TYPE system_load_average_1m gauge
system_load_average_1m 2.69384765625
# HELP jvm_threads_daemon_threads The current number of live daemon threads
# TYPE jvm_threads_daemon_threads gauge
jvm_threads_daemon_threads 18.0
# HELP tomcat_sessions_created_sessions_total
# TYPE tomcat_sessions_created_sessions_total counter
tomcat_sessions_created_sessions_total 0.0
# HELP system_cpu_usage The "recent cpu usage" for the whole system
# TYPE system_cpu_usage gauge
system_cpu_usage 0.0
# HELP process_start_time_seconds Start time of the process since unix epoch.
# TYPE process_start_time_seconds gauge
process_start_time_seconds 1.613914210244E9
# HELP process_files_max_files The maximum file descriptor count
# TYPE process_files_max_files gauge
process_files_max_files 10240.0
# HELP jvm_buffer_memory_used_bytes An estimate of the memory that the Java virtual machine is using for this buffer pool
# TYPE jvm_buffer_memory_used_bytes gauge
jvm_buffer_memory_used_bytes{id="direct",} 8192.0
jvm_buffer_memory_used_bytes{id="mapped",} 0.0
# HELP jvm_gc_memory_allocated_bytes_total Incremented for an increase in the size of the (young) heap memory pool after one GC to before the next
# TYPE jvm_gc_memory_allocated_bytes_total counter
jvm_gc_memory_allocated_bytes_total 9.2060064E7
* Connection #0 to host 127.0.0.1 left intact
* Closing connection 0
3.添加自定义Counter和Gauge
package com.github.shoothzj.demo.prometheus;
import io.micrometer.core.instrument.Counter;
import io.micrometer.core.instrument.Gauge;
import io.micrometer.core.instrument.MeterRegistry;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Service;
import javax.annotation.PostConstruct;
import java.util.Random;
import java.util.function.Supplier;
/**
* @author hezhangjian
*/
@Slf4j
@Service
public class PrometheusService {
@Autowired
private MeterRegistry meterRegistry;
Counter testCounter;
@PostConstruct
public void init() {
testCounter = Counter.builder("test_counter").tag("key", "value").register(meterRegistry);
Gauge.builder("test_builder", new Supplier<Number>() {
@Override
public Number get() {
return new Random().nextDouble();
}
}).register(meterRegistry);
}
@Scheduled(fixedDelay = 10)
public void scheduleCounter() {
testCounter.increment(new Random().nextDouble());
}
}
随后请求/actuator/prometheus 接口，可以看到新增的Gauge和Count
curl 127.0.0.1:8080/actuator/prometheus|grep test
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 8407 100 8407 0 0 1641k 0 --:--:-- --:--:-- --:--:-- 1368k
# HELP test_builder
# TYPE test_builder gauge
test_builder 0.7230810083096657
# HELP test_counter_total
# TYPE test_counter_total counter
test_counter_total{key="value",} 4226.16496944851
代码地址
https://github.com/Shoothzj/maven-demo/tree/master/demo-prometheus
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