I've been looking at examples in the Java and C++ client libs, and it
doesn't mirror my understanding of label rules:
https://github.com/prometheus/client_java#labels
I thought:
1. each metric could have zero or more named labels
2. each label must have a pre-determined set of allowed values
3. when setting a metric value, all label dimensions *must* be specified
from these allowed values
But the examples don't work that way:
Counter calculationsCounter = Counter.build()
.name("my_library_calculations_total").help("Total calls.")
.labelNames("key").register();
...
void processThatCalculates(String key) {
calculationsCounter.labels(key).inc(); // Run calculations. } }
In this example, I don't see where "key" allowed values are enumerated. I
also don't see how labels(key) knows which label it is referring to. I
might have multiple labels.
I wish I could find a non-trivial example which shows what the output
scrape would look like. Can anyone help?
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