CloudMonitor evaluates the load of Elastic Compute Service (ECS) resources by using an overall performance score that combines CPU and memory metrics.
- Low: The overall performance score ranges from 0 to 5.
- Normal: The overall performance score ranges from 5 to 80.
- High: The overall performance score ranges from 80 to 100.
Overall performance score of ECS resources = 0.85 × Average score of (Agent)cpu.total + 0.15 × Average score of (Agent)memory.used.utilization
- Daily score of each metric for each resource = Aggregate data of a metric every 5 minutes on a day × Metric weight according to the entropy weight method (EWM)
For example: Metric A has 288 (1440 minutes/5 minutes) aggregate data records on a day, which are A0, A1, A2…A287. Correspondingly, 288 EWM weights can be calculated, which are W0, W1, W2…W287. The score of Metric A on a day is:
Daily score of Metric A (B1) = A0 × W0 + A1 × W1 + A2 × W2 +... + A287 × W287
- Average score of a metric in each statistical period (day) = Sum of the metric scores for each metric per day / Statistical period
For example, the scores of Metric A for a resource within 5 days are B1, B2, B3, B4, and B5. The average score of Metric A within 5 days is:
Average score of Metric A = (B1 + B2 + B3 + B4 + B5) / 5 days