The Prometheus monitoring system and time series database.
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tests:
- input_series:
- series: 'join_1{a="1",b="2"}'
values: 1
- series: 'join_2{a="1",b="3"}'
values: 2
- series: 'join_2{a="1",b="4"}'
values: 3
promql_expr_test:
# This PromQL generates an error.
- expr: "join_1 + on(a) join_2"