Included this dependency:

        
            org.springframework.boot
            spring-boot-starter-actuator
        

Still 404 at http://localhost:8100/actuator/health (GET from a browser).

application.yml:

server:
  port: 8100

logging:
  level:
    root: ${ROOT_LOGGING_LEVEL:info}
    org.hibernate.orm.jdbc.bind: trace

spring:
  datasource:
    username: ${POSTGRES_USERNAME:postgres}
    password: ${POSTGRES_PASSWORD:postgres}
    url: ${POSTGRES_URL:jdbc:postgresql://localhost:5432/postgres}
  jpa:
    hibernate:
      ddl-auto: none
    show-sql: true
    properties:
      hibernate:
        format_sql: true
  liquibase:
    change-log: classpath:db/migration/db.changelog-master.yml

management:
  endpoints:
    web:
      exposure:
        include: "health,info,metrics"

Spring Boot 4.