Spring Boot Admin实现服务健康预警功能

<dependency>
 <groupId>org.springframework.boot</groupId>
 <artifactId>spring-boot-starter-mail</artifactId>
</dependency>

spring.mail.host=your email smtp server
spring.mail.password=your password
spring.mail.port=your email smtp server port
spring.mail.test-connection=true
spring.mail.username=837718548@qq.com 

spring.boot.admin.notify.mail.from=837718548@qq.com
spring.boot.admin.notify.mail.ignore-changes=""
spring.boot.admin.notify.mail.to=目标邮箱

spring.boot.admin.notify.mail.template=classpath:/templates/status-changed.html

public class FlyBookNotifier extends AbstractStatusChangeNotifier {

 private static final String DEFAULT_MESSAGE = "#{instance.registration.name} (#{instance.id}) 状态发生转变 #{lastStatus} ➡️ #{instance.statusInfo.status} " +
  "\n" +
  "\n 实例详情：#{instanceEndpoint}";

 private final SpelExpressionParser parser = new SpelExpressionParser();

 private RestTemplate restTemplate;

 private URI webhookUrl;

 private Expression message;

 public FlyBookNotifier(InstanceRepository repository, RestTemplate restTemplate) {
 super(repository);
 this.restTemplate = restTemplate;
 this.message = parser.parseExpression(DEFAULT_MESSAGE, ParserContext.TEMPLATE_EXPRESSION);
 }

 @Override
 protected Mono<Void> doNotify( InstanceEvent event, Instance instance) {
 if (webhookUrl == null) {
  return Mono.error(new IllegalStateException("'webhookUrl' must not be null."));
 }
 return Mono
  .fromRunnable(() -> restTemplate.postForEntity(webhookUrl, createMessage(event, instance), Void.class));
 }

 public void setRestTemplate(RestTemplate restTemplate) {
 this.restTemplate = restTemplate;
 }

 protected Object createMessage(InstanceEvent event, Instance instance) {
 Map<String, Object> messageJson = new HashMap<>();
 messageJson.put("title", "👹警告&👼提醒");
 messageJson.put("text", getText(event, instance));

 HttpHeaders headers = new HttpHeaders();
 headers.setContentType(MediaType.APPLICATION_JSON);
 return new HttpEntity<>(messageJson, headers);
 }


 protected String getText(InstanceEvent event, Instance instance) {
 Map<String, Object> root = new HashMap<>();
 root.put("event", event);
 root.put("instance", instance);
 root.put("instanceEndpoint", instance.getEndpoints().toString());
 root.put("lastStatus", getLastStatus(event.getInstance()));
 StandardEvaluationContext context = new StandardEvaluationContext(root);
 context.addPropertyAccessor(new MapAccessor());
 return message.getValue(context, String.class);
 }


 public URI getWebhookUrl() {
 return webhookUrl;
 }

 public void setWebhookUrl(URI webhookUrl) {
 this.webhookUrl = webhookUrl;
 }

 public String getMessage() {
 return message.getExpressionString();
 }

 public void setMessage(String message) {
 this.message = parser.parseExpression(message, ParserContext.TEMPLATE_EXPRESSION);
 }
}

@Configuration
public static class NotifierConfiguration {
 @Bean
 @ConditionalOnMissingBean
 @ConfigurationProperties("spring.boot.admin.notify.flybook")
 public FlyBookNotifier flyBookNotifier(InstanceRepository repository) {
 return new FlyBookNotifier(repository, new RestTemplate());
 }
}

spring.boot.admin.notify.flybook.ignore-changes=""
spring.boot.admin.notify.flybook.webhook-url=https://open.feishu.cn/open-apis/bot/hook...