INVALID_OBSERVED_METRICS error condition
Invalid observed metrics.
AGGREGATE_EXPRESSION_WITH_DISTINCT_UNSUPPORTED
Aggregate expressions with DISTINCT are not allowed in observed metrics, but found: <expr>.
AGGREGATE_EXPRESSION_WITH_FILTER_UNSUPPORTED
Aggregate expression with FILTER predicate are not allowed in observed metrics, but found: <expr>.
MISSING_NAME
The observed metrics should be named: <operator>.
NESTED_AGGREGATES_UNSUPPORTED
Nested aggregates are not allowed in observed metrics, but found: <expr>.
NON_AGGREGATE_FUNC_ARG_IS_ATTRIBUTE
Attribute <expr> can only be used as an argument to an aggregate function.
NON_AGGREGATE_FUNC_ARG_IS_NON_DETERMINISTIC
Non-deterministic expression <expr> can only be used as an argument to an aggregate function.
WINDOW_EXPRESSIONS_UNSUPPORTED
Window expressions are not allowed in observed metrics, but found: <expr>.