# Performance Insights for counter metrics
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Counter metrics are operating system metrics in the Performance Insights dashboard. To help identify and analyze performance problems, you can correlate counter metrics with DB load.

## Performance Insights operating system counters
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The following operating system counters are available with Amazon DocumentDB Performance Insights.


| Counter | Type | Metric | 
| --- | --- | --- | 
| active | memory | os.memory.active | 
| buffers | memory | os.memory.buffers | 
| cached | memory | os.memory.cached | 
| dirty | memory | os.memory.dirty | 
| free | memory | os.memory.free | 
| inactive | memory | os.memory.inactive | 
| mapped | memory | os.memory.mapped | 
| pageTables | memory | os.memory.pageTables | 
| slab | memory | os.memory.slab | 
| total | memory | os.memory.total | 
| writeback | memory | os.memory.writeback | 
| idle | cpuUtilization | os.cpuUtilization.idle | 
| system | cpuUtilization | os.cpuUtilization.system | 
| total | cpuUtilization | os.cpuUtilization.total | 
| user | cpuUtilization | os.cpuUtilization.user | 
| wait | cpuUtilization | os.cpuUtilization.wait | 
| one | loadAverageMinute | os.loadAverageMinute.one | 
| fifteen | loadAverageMinute | os.loadAverageMinute.fifteen | 
| five | loadAverageMinute | os.loadAverageMinute.five | 
| cached | swap | os.swap.cached | 
| free | swap | os.swap.free | 
| in | swap | os.swap.in | 
| out | swap | os.swap.out | 
| total | swap | os.swap.total | 
| rx | network | os.network.rx | 
| tx | network | os.network.tx | 
| numVCPUs | general | os.general.numVCPUs |