expected_expression

Summary

expected expression

Help

expected metric name, number, or (

Details

When this fires

The parser hit a position where it needed a primary expression (a metric name, a number, or a parenthesised group) and found something else, like a stray operator, a closing bracket, or end-of-input.

What to check

Common culprits: an operator with nothing on one side, unbalanced parentheses, stray commas, or trailing and / or.

# broken
expr = "cpu.usage > "
# fixed
expr = "cpu.usage > 90"

Caught by nanook check. See @/docs/nanook-expr.md for the grammar.