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.