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The Thread Count graph plots the number of threads used, over time, during the period defined on the range navigator. This information is useful in helping you determine whether thread activity is affecting application performance or caused a system anomaly. Thread usage on this graph refers to these metrics:
The number of active threads.
The number of threads terminated by Java when the active threads, including the main thread of execution, are no longer running (that is, daemon threads).
If you want to see a more detailed view of a specific section of the graph, you can zoom in by placing your pointer over the start point for the time range you want to see and, while holding down the left mouse button, drag to the right. The selected range will appear in black on the graph. When you release the button, just the selected range will appear on the graph and the Range Navigator reconfigures to show just the events in the selected range. To zoom out, expand the time range shown on the Range Navigator.