Update keps/sig-network/1880-multiple-service-cidrs/README.md

Author: aojea

keps/sig-network/1880-multiple-service-cidrs/README.md

@@ -849,7 +849,9 @@ The feature depends on the API server to work, however, the components consuming
 ###### What are other known failure modes?
 
 - Can not create Service with ClusterIP
-  - Detection: via metrics or because an Create Service API call fails
+  - Detection: via metrics that record errors and latency to allocate an Cluster IP, the allocator also log slow operations in `pkg/registry/core/service/ipallocator/ipallocator.go`
+> 	trace := utiltrace.New("allocate dynamic ClusterIP address")
+>	defer trace.LogIfLong(500 * time.Millisecond)
   - Mitigations: already running workloads will not be affected, if no new services can be created first check if is because there
 are not available IPs checking the metrics with the number of available IPs
   - Diagnostics: The ServiceCIDR object has conditions in state that can help to understand if there is some problems with