Use this page as a reference for properties of proxy counters.
You can use the Performance Monitoring Infrastructure (PMI) data to monitor the behavior and performance of the proxy service.
| Name | Key | Description | Granularity | Type | Level | Overhead |
| OutboundConnectionCount | OutboundConnectionCount | The total number of outbound connections since server start. | Per proxy server | CountStatistic | Basic | Low |
| ActiveOutboundConnectionCount | ActiveOutboundConnectionCount | The total concurrent outbound connection count at a specific time | Per proxy server | CountStatistic | Basic | Low |
| RequestCount | RequestCount | The total number of requests processed by the proxy server since server start. | Per proxy server | CountStatistic | Basic | Low |
| FailedRequestCount | FailedRequestCount | The number of failed requests due to an internal error. | Per proxy server | CountStatistic | Extended | Low |
| ProxiedRequestCount | ProxiedRequestCount | The number of requests forwarded to back-end application servers or Web servers. | Per proxy server | CountStatistic | Extended | Low |
| LocalRequestCount | LocalRequestCount | The number of requests served locally from the proxy. Includes cache hits and failed requests due to internal error. | Per proxy server | CountStatistic | Extended | Low |
| ResponseTime(TTLB) | ResponseTime(TTLB) | Proxy Server response time. The number of milliseconds that have passed before the last byte of the response was sent back to client. | Per request | TimeStatistic | Extended | Medium |
| ServerResponseTime | ServerResponseTime | Target server response time, The number of milliseconds that have passed before proxy received the first byte from target servers. | Per request | CountStatistic | Extended | Medium |
| CacheHitCountValidated | CacheHitCountValidated | The total cache hit count revalidated with target servers. | Per proxy server | CountStatistic | Basic | Low |
| CacheHitCountUnvalidated | CacheHitCountUnvalidated | The total cache hit count processed locally. | Per proxy server | CountStatistic | Basic | Low |
| CacheMissCount | CacheMissCount | The total cache miss count. | Per proxy server | CountStatistic | Basic | Low |
| CacheEsiInvalidateCount | CacheEsiInvalidateCount | The total ESI cache invalidate count. | Per proxy server | CountStatistic | Basic | Low |
| CacheEsiEdgeCacheableCount | CacheEsiEdgeCacheableCount | The number of responses that are ESI edge cacheable. | Per proxy server | CountStatistic | Extended | Low |
| CacheEsiEdgeCachedCount | CacheEsiEdgeCachedCount | The number of ESI edge cacheable responses that are really cached in the proxy server | Per proxy server | CountStatistic | Extended | Low |
| ActiveServiceContextCount | ActiveServiceContextCount | The number of active service contexts in the proxy at a given time. | Per proxy server | CountStatistic | Extended | High |
| SuspendedServiceContextCount | SuspendedServiceContextCount | The number of suspended service context in the proxy at a given time. | Per proxy server | CountStatistic | Extended | High |