You can monitor all the CPU load, disk I/O, and network I/O metrics such as avg CPU utilization, avg disk reads, avg disk writes, max network in, and max network out without additional charges. But the main difference is without being charged, you can collect these metrics every five minute intervals and will be stored for two weeks and it charges $0.015/per hour per instance to get for one-minute intervals.
You can check out this AWS Cloud Migration Training course by Intellipaat if you want to learn AWS data migration.
Also, watch this video on Amazon CloudWatch:
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