doc: 阅读CircuitBreaker文档

spring/Spring Cloud/CircuitBreaker/CircuitBreaker.md

@@ -276,3 +276,37 @@ CircuitBreakerRegistry circuitBreakerRegistry =
 - 如果recordFailurePredicate不为空，根据`recordFailurePredicate`判断是否该异常应当被视为failure，如果返回为true，将其视为failure，否则继续
 - 如果上述都不满足，那么将其视为success
 
+创建自定义`CircuitBreakerConfig`的示例如下所示：
+```java
+// Create a custom configuration for a CircuitBreaker
+CircuitBreakerConfig circuitBreakerConfig = CircuitBreakerConfig.custom()
+  .failureRateThreshold(50)
+  .slowCallRateThreshold(50)
+  .waitDurationInOpenState(Duration.ofMillis(1000))
+  .slowCallDurationThreshold(Duration.ofSeconds(2))
+  .permittedNumberOfCallsInHalfOpenState(3)
+  .minimumNumberOfCalls(10)
+  .slidingWindowType(SlidingWindowType.TIME_BASED)
+  .slidingWindowSize(5)
+  .recordException(e -> INTERNAL_SERVER_ERROR
+                 .equals(getResponse().getStatus()))
+  .recordExceptions(IOException.class, TimeoutException.class)
+  .ignoreExceptions(BusinessException.class, OtherBusinessException.class)
+  .build();
+
+// Create a CircuitBreakerRegistry with a custom global configuration
+CircuitBreakerRegistry circuitBreakerRegistry = 
+  CircuitBreakerRegistry.of(circuitBreakerConfig);
+
+// Get or create a CircuitBreaker from the CircuitBreakerRegistry 
+// with the global default configuration
+CircuitBreaker circuitBreakerWithDefaultConfig = 
+  circuitBreakerRegistry.circuitBreaker("name1");
+
+// Get or create a CircuitBreaker from the CircuitBreakerRegistry 
+// with a custom configuration
+CircuitBreaker circuitBreakerWithCustomConfig = circuitBreakerRegistry
+  .circuitBreaker("name2", circuitBreakerConfig);
+```
+
+