What to keep
Lending and stablecoin systems often ask an oracle whether collateral is sufficient.
If the price is stale, thin, or pushed, the health check follows the price.
The fix is not a slogan about decentralisation. It is the source, the quorum, the delay, and what the system does when the oracle stops.
What this is not
Not a complaint, not a price chart, and not a complete history. Primary sources outrank this summary.