The following table lists identifiers of threshold alerts for OS 2200 systems. One of these alerts is raised when the corresponding system parameter violates the threshold expression that the Operations Sentinel administrator has specified for it.
See OS 2200 Threshold Properties for more information on OS 2200 system thresholds.
| Alert Identifier | Parameter Name | Description |
| _OSActiveTxn | Active Transaction | Number of active transactions. |
| _OSBacklog | Backlog | Number of unopened runs. |
| _OSBatchIP | Batch IP | Percentage of IP SUP usage by user programs using batch and deadline batch processing. |
| _OSBatchOpen | Batch Open | Number of open batch runs. |
| _OSDemandIP | Demand IP | Percentage of IP SUP usage by user programs using demand processing. |
| _OSDemandOpen | Demand Open | Number of demand runs open. |
| _OSExpoolAlarm | E11 EXPOOL Percentage EXPOOL Available | Number of E11-size EXPOOL buffers remaining. Percentage of EXPOOL remaining. Available EXPOOL in thousands of words. |
| _OSIdle | Idle | The system is idle. |
| _OSHolds | Holds | The reasons runs are being held. |
| _OSMSAvailable | KMS Available | Available mass storage in the local directory in number of tracks. |
| _OSMemoryAvail | KW MEM Available | Available memory in millions of words. |
| _OSMemSwapfile | Mem Swapfile % | The percentage of the swapfile in use. |
| _OSPageIOs | Page IO | Number of Page I/Os. |
| _OSPhysicalMem | Physical Mem % | The percentage of physical memory in use. |
| _OSQueuedTxns | Queued Transactions | Number of queued transactions. |
| _OSRealTimeIP | Realtime IP | Percentage of IP SUP usage by real-time programs. |
| _OSTipIP | TIP IP | Percentage of IP SUP usage by user programs using TIP. |
| _OSTxnRate | Transaction Rate | The TIP rate measured in transactions per second. |
| _OSBacklog | Backlog | The number of runs in backlog. |