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Full-scale testing is required to test the network stability under changes. Potential users and validators will be able to prepare their services in advance for real conditions if there’s a test network (or testnet) Testnet is the most complete copy of the main network. Monitoring, metrics and colorful graphics are not a caprice of a perfectionist, but necessary tools to evaluate project development. In particular, the number of active peers can be a useful metric (peers are equal participants in the network) for complex transactions.