You use Performance Monitor counters to monitor Instant Messaging activity. For this purpose, Instant Messaging provides several client-to-server and server-to-server counters to indicate whether the service is processing data. When these counters approach zero, Instant Messaging has little or no data to process (that is, few or no requested client connections) or the service is not functioning properly.
| Counter | Description |
|---|---|
| Current Online Users | The current number of users logged on to the server |
| Current Outbound Connections | The number of all open outbound connections |
| Current Subscriptions | The current number of subscriptions |
| DNS Lookups/sec | The average number of DNS lookups per second |
| DS Hits/sec | The average number of reads from the directory server per second |
| DS Hits since startup | The total number of reads from the directory server since Instant Messaging was started |
| Failed Authentications/sec | The average number of failed RVP authentications issued per second |
| Failed Request/sec | The average number of failed requests per second, including those rejected because of server load |
| IM Task Queue Backlog | The size of the Instant Messaging queue backlog |
| IM Threads Idle | The total number of idle threads owned by the Instant Messaging service |
| IM Threads Total | The total number of threads owned by the Instant Messaging service |
| Inbound ACLs/sec | The average number of access control list (ACL) requests per second |
| Inbound NOTIFYs/sec | The average number of NOTIFY requests per second coming into the server |
| Inbound OPTIONs/sec | The average number of OPTION requests per second |
| Inbound PROPFINDs/sec | The average number of PROPFIND requests per second |
| Inbound PROPPATCHs/sec | The average number of PROPPATCH requests per second |
| Inbound Response Bytes/Sec | The average number of inbound response bytes transferred per second |
| Inbound SUBSCRIBEs/sec | The average number of SUBSCRIBE requests per second |
| Inbound UNSUBSCRIBEs/sec | The average number of UNSUBSCRIBE requests per second |
| Outbound Connections | The average number of open outbound connections per second |
| Outbound NOTIFYs/sec | The average number of NOTIFY requests per second going out from the server |
| Outbound Response Bytes/sec | The average number of outbound response bytes transferred per second |
| Redirects/sec | The average number of HTTP redirects issued per second |
| Rejected Requests/sec | The average number of requests rejected due to server load per second |
| Request Forwarded/sec | The average number of requests forwarded per second |
| Total Failed Authentications | The total number of failed RVP authentications issued since startup |
| Total Failed Requests since startup | The total number of requests that have failed since service startup, including those rejected due to server load |
| Total Redirects since startup | The total number of HTTP redirects issued since service startup |
| Total Rejected Requests since startup | The total number of requests rejected because of server load since service startup |
| Total Requests Forwarded since startup | The total number of requests forwarded since service startup |