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tikv / rust-prometheus

Prometheus instrumentation library for Rust applications
Apache License 2.0
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Dose histogram support merge operation? #468

Open simon-fu opened 1 year ago

simon-fu commented 1 year ago

For example, there are two histogram variables named h1 and h2 as :

# TYPE h1 histogram
h1_bucket{le="0"} 3
h1_bucket{le="1"} 5
h1_bucket{le="2"} 8
h1_bucket{le="+Inf"} 8
h1_sum 8
h1_count 8
# HELP h2 The second h2
# TYPE h2 histogram
h2_bucket{le="0"} 1
h2_bucket{le="1"} 3
h2_bucket{le="2"} 6
h2_bucket{le="+Inf"} 6
h2_sum 8
h2_count 6

After merge h1 and h2 into h3, we got: 

# TYPE h3 histogram
h3_bucket{le="0"} 4
h3_bucket{le="1"} 8
h3_bucket{le="2"} 14
h3_bucket{le="+Inf"} 14
h3_sum 16
h3_count 14