1. A method of identifying an inter-relationship between performance metrics of a computer system, the method comprising steps of: obtaining a first metric signal for a first performance metric, the first metric signal representing a variation of the first performance metric over time; obtaining a second metric signal for a second performance metric, the second metric signal representing a variation of the second performance metric over time; converting the first metric signal into a first quantized signal having a first set of allowable discrete values; converting the second metric signal into a second quantized signal having a second set of allowable discrete values; detecting a correlation between the first and second quantized signals based on a timing of variations in the first and second quantized signals; and identifying an inter-relationship between the first and second performance metrics based on the detected correlation between the first and second quantized signals.