eval_division_by_zero

Summary

division by zero

Help

ensure the divisor is non-zero before applying /

Details

When this fires

Runtime error from the evaluator when a / divides by zero. Most often the divisor is a metric that legitimately reads 0 (idle counter, empty queue), or an arithmetic subexpression that collapses to zero on certain hosts.

What to check

Guard the divisor with a comparison before the division.

# broken: explodes when net.tx is 0
expr = "net.rx / net.tx > 2"
# fixed: gate on the divisor first
expr = "net.tx > 0 and net.rx / net.tx > 2"