I have this query:
*((node_memory_MemTotal{instance="hostname.example.com:9100"} -
(node_memory_MemFree + node_memory_Buffers + node_memory_Cached)) /
node_memory_MemTotal) * 100 *
I'm surprised to find that every other metric after:
*node_memory_MemTotal{instance="hostname.example.com:9100"}*
"knows" to use that instance, such as node_memory_MemFree, and that I don't
need to declare that instance every time thereafter so that the query grows
into:
*((node_memory_MemTotal{instance="hostname.example.com:9100"} -
(node_memory_MemFree{instance="hostname.example.com:9100"} +
node_memory_Buffers{instance="hostname.example.com:9100"} +
node_memory_Cached{instance="hostname.example.com:9100"})) /
node_memory_MemTotal{instance="hostname.example.com:9100"}) * 100*
How does Prometheus know to keep and use that same returned instance for
the entire query?
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