我们正在尝试向 Prometheus 公开我们的 redis 缓存指标。以下是我们所做的。
我们有一个类CachingConfig
如下,
@Configuration
@EnableCaching
public class CachingConfig {
private final Duration cacheEntryTtl;
public CachingConfig(
@Value("${spring.cache.redis.entryTtl}")
final Duration cacheEntryTtl
) {
this.cacheEntryTtl = cacheEntryTtl;
}
@Bean
public CacheManager cacheManager(final RedisConnectionFactory redisConnectionFactory) {
final Map<String, RedisCacheConfiguration> cacheConfigurations = new HashMap<>();
cacheConfigurations.put("cacheA",cacheConfiguration(cacheEntryTtl));
cacheConfigurations.put("cacheB",cacheConfiguration(cacheEntryTtl));
return RedisCacheManager.builder(redisConnectionFactory)
.cacheDefaults(cacheConfiguration(cacheEntryTtl))
.withInitialCacheConfigurations(cacheConfigurations)
.build();
}
}
然后我们在我们的类中使用 Redis 缓存,如下所示。
public class BusinessService {
public static final String CACHE_A_NAME = "cacheA"
private final BusinessServiceClient businessServiceClient;
private final CacheManager cacheManager;
private final CacheMetricsRegistrar cacheMetricsRegistrar;
@PostConstruct
public void postConstruct() {
final Cache cache = cacheManager.getCache(CACHE_A_NAME);
cacheMetricsRegistrar.bindCacheToRegistry(cache);
}
@Cacheable(cacheNames = CACHE_A_NAME)
public Set<String> getOwnersOfProviderAccount(String para1, String para2) {
return businessServiceClient.getResonponse(para1, para2);
}
}
根据这个,我还在我们的application.properties
文件中添加了以下几行。
spring.cache.type=redis
spring.cache.redis.enable-statistics=true
所以理论上,Redis 缓存指标应该能够工作,但是当我从以下 URL 检查我们的缓存指标时。
GET .../actuator/metrics/cache.gets?tag=name:cacheA
响应总是如下所示,COUNT 总是为零,似乎统计数据不起作用,但我们的 Redis 缓存仍然有效。
{
"name":"cache.gets",
"description":"The number of pending requests",
"baseUnit":null,
"measurements":[
{
"statistic":"COUNT",
"value":0.0
}
],
"availableTags":[
{
"tag":"result",
"values":[
"hit",
"pending",
"miss"
]
},
{
"tag":"cache",
"values":[
"cacheA"
]
},
{
"tag":"application",
"values":[
"business-service"
]
},
{
"tag":"cacheManager",
"values":[
"cacheManager"
]
}
]
}
而且,如果我们检查来自 的指标/management/prometheus
,这就是我们得到的,所有值都是零。
# HELP cache_gets_total the number of times cache lookup methods have returned an uncached (newly loaded) value, or null
# TYPE cache_gets_total counter
cache_gets_total{application="business-service",cache="cacheA",cacheManager="cacheManager",name="cacheA",result="miss",} 0.0
cache_gets_total{application="business-service",cache="cacheA",cacheManager="cacheManager",name="cacheA",result="pending",} 0.0
cache_gets_total{application="business-service",cache="cacheA",cacheManager="cacheManager",name="cacheA",result="hit",} 0.0
我在配置 Redis 缓存指标时有什么遗漏的吗?谢谢,任何建设性的建议表示赞赏。