If you could track only 3 Bitcoin metrics

If you could track only 3 Bitcoin metrics, which ones would you choose? There are so many Bitcoin indicators that it can become difficult to separate useful information from noise. If you were forced to monitor only three metrics to understand Bitcoin's market and long-term health, what would you choose? For example: On-chain activity Exchange balances Hash rate Miner behavior ETF/institutional flows Long-term holder activity Realized price Network fees Liquidity/macroeconomic data Something completely different And more importantly: why those three? I'm interested in metrics that actually help explain what is happening—not just indicators that look impressive on a chart.