The Monitoring Cost Budget Discipline

Most teams spend 5-15% of infrastructure cost on monitoring. The budget discipline that catches monitoring sprawl before it doubles.

Healthy ratio

Monitoring spend as % of infrastructure spend: 5-15% is healthy. Below 5%: probably under-instrumented. Above 15%: probably over-instrumented.

Track monthly. Trend lines matter more than the absolute number.

Compare against peers in your industry. SaaS averages around 8%; high-availability averages closer to 15%.

Cost drivers

High-cardinality metrics. The single biggest cost driver. Audit cardinality quarterly.

Log volume. Verbose services produce expensive logs. Tune log levels in production.

Trace sampling. 100% sampling is rarely needed; tune sampling to fit the budget.

Budget policy

Monthly review with finance. The monitoring spend gets the same scrutiny as compute spend.

Each new metric has a cost owner. The owner is responsible for retiring it if value drops.

Quarterly metric retirement. Lowest-value metrics get retired; the budget rebalances.