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metrics's Introduction

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About

Atomic measures with Prometheus exposition for the Go programming language.

This is free and unencumbered software released into the public domain.

Use

Metric regisration on package level comes recommened. The declarations help to document the provided funcionality too.

var (
	ConnectCount = metrics.MustCounter("db_connects_total", "Number of established initiations.")
	CacheBytes   = metrics.MustInteger("db_cache_bytes", "Size of collective responses.")
	DiskUsage    = metrics.Must1LabelRealSample("db_disk_usage_ratio", "device")
)

Updates are error free by design, e.g., CacheBytes.Add(-72) or DiskUsage(dev.Name).Set(1 - dev.Free, time.Now()).

Serve HTTP with just http.HandleFunc("/metrics", metrics.ServeHTTP).

< HTTP/1.1 200 OK
< Content-Type: text/plain;version=0.0.4;charset=utf-8
< Date: Sun, 07 Mar 2021 15:22:47 GMT
< Content-Length: 351
< 
# Prometheus Samples

# TYPE db_connects_total counter
# HELP db_connects_total Number of established initiations.
db_connects_total 4 1615130567389

# TYPE db_cache_bytes gauge
# HELP db_cache_bytes Size of collective responses.
db_cache_bytes 7600 1615130567389

# TYPE db_disk_usage_ratio gauge
db_disk_usage_ratio{device="sda"} 0.19 1615130563595

Package github.com/pascaldekloe/metrics/gostat provides a defacto standard collection of Go metrics, similar to the setup from the original Prometheus library. See the lazy example for detail on capturing.

Performance

The following benchmarks were measured on a Intel(R) Core(TM) i5-7500 CPU @ 3.40GHz.

name                          time/op
Label/sequential/4-4            22.2ns ± 1%
Label/sequential/4x4-4          25.9ns ± 1%
Label/sequential/4x4x4-4        42.2ns ± 1%
Label/parallel/4-4              45.9ns ± 0%
Label/parallel/4x4-4            50.8ns ± 1%
Label/parallel/4x4x4-4          71.7ns ± 1%
Get/histogram5/sequential-4     89.1ns ± 0%
Get/histogram5/2routines-4       112ns ± 2%
Set/real/sequential-4           6.74ns ± 0%
Set/real/2routines-4            14.8ns ± 4%
Set/sample/sequential-4         18.6ns ± 6%
Set/sample/2routines-4          22.2ns ± 1%
Add/counter/sequential-4        6.75ns ± 0%
Add/counter/2routines-4         21.2ns ± 1%
Add/integer/sequential-4        6.75ns ± 0%
Add/integer/2routines-4         21.2ns ± 1%
Add/histogram5/sequential-4     37.9ns ± 0%
Add/histogram5/2routines-4      85.9ns ± 1%
ServeHTTP/32/counter-4          1.11µs ± 0%
ServeHTTP/32/real-4             2.24µs ± 1%
ServeHTTP/32/integer-4          1.13µs ± 1%
ServeHTTP/32/histogram5-4       9.85µs ± 0%
ServeHTTP/32/label5-4           2.73µs ± 1%
ServeHTTP/32/label2x3x5-4       2.79µs ± 2%
ServeHTTP/32/sample-4           2.70µs ± 1%
ServeHTTP/1024/counter-4        32.1µs ± 1%
ServeHTTP/1024/real-4           62.5µs ± 2%
ServeHTTP/1024/integer-4        32.6µs ± 1%
ServeHTTP/1024/histogram5-4      303µs ± 1%
ServeHTTP/1024/label5-4         76.3µs ± 4%
ServeHTTP/1024/label2x3x5-4     75.8µs ± 3%
ServeHTTP/1024/sample-4         77.7µs ± 3%
ServeHTTP/32768/counter-4       1.18ms ± 1%
ServeHTTP/32768/real-4          2.15ms ± 1%
ServeHTTP/32768/integer-4       1.20ms ± 4%
ServeHTTP/32768/histogram5-4    13.9ms ± 2%
ServeHTTP/32768/label5-4        2.99ms ± 1%
ServeHTTP/32768/label2x3x5-4    2.90ms ± 4%
ServeHTTP/32768/sample-4        2.70ms ± 6%

name                          alloc/op
Label/sequential/4-4             0.00B     
Label/sequential/4x4-4           0.00B     
Label/sequential/4x4x4-4         0.00B     
Label/parallel/4-4               0.00B     
Label/parallel/4x4-4             0.00B     
Label/parallel/4x4x4-4           0.00B     
Get/histogram5/sequential-4      0.00B     
Get/histogram5/2routines-4       0.00B     
Set/real/sequential-4            0.00B     
Set/real/2routines-4             0.00B     
Set/sample/sequential-4          0.00B     
Set/sample/2routines-4           0.00B     
Add/counter/sequential-4         0.00B     
Add/counter/2routines-4          0.00B     
Add/integer/sequential-4         0.00B     
Add/integer/2routines-4          0.00B     
Add/histogram5/sequential-4      0.00B     
Add/histogram5/2routines-4       0.00B     
ServeHTTP/32/counter-4            560B ± 0%
ServeHTTP/32/real-4               512B ± 0%
ServeHTTP/32/integer-4            560B ± 0%
ServeHTTP/32/histogram5-4       1.19kB ± 0%
ServeHTTP/32/label5-4             560B ± 0%
ServeHTTP/32/label2x3x5-4         752B ± 0%
ServeHTTP/32/sample-4             512B ± 0%
ServeHTTP/1024/counter-4          560B ± 0%
ServeHTTP/1024/real-4             560B ± 0%
ServeHTTP/1024/integer-4          560B ± 0%
ServeHTTP/1024/histogram5-4     1.19kB ± 0%
ServeHTTP/1024/label5-4           560B ± 0%
ServeHTTP/1024/label2x3x5-4       576B ± 0%
ServeHTTP/1024/sample-4           560B ± 0%
ServeHTTP/32768/counter-4         565B ± 0%
ServeHTTP/32768/real-4            569B ± 0%
ServeHTTP/32768/integer-4         565B ± 0%
ServeHTTP/32768/histogram5-4    1.26kB ± 0%
ServeHTTP/32768/label5-4          573B ± 0%
ServeHTTP/32768/label2x3x5-4      588B ± 0%
ServeHTTP/32768/sample-4          571B ± 0%

name                          allocs/op
Label/sequential/4-4              0.00     
Label/sequential/4x4-4            0.00     
Label/sequential/4x4x4-4          0.00     
Label/parallel/4-4                0.00     
Label/parallel/4x4-4              0.00     
Label/parallel/4x4x4-4            0.00     
Get/histogram5/sequential-4       0.00     
Get/histogram5/2routines-4        0.00     
Set/real/sequential-4             0.00     
Set/real/2routines-4              0.00     
Set/sample/sequential-4           0.00     
Set/sample/2routines-4            0.00     
Add/counter/sequential-4          0.00     
Add/counter/2routines-4           0.00     
Add/integer/sequential-4          0.00     
Add/integer/2routines-4           0.00     
Add/histogram5/sequential-4       0.00     
Add/histogram5/2routines-4        0.00     
ServeHTTP/32/counter-4            5.00 ± 0%
ServeHTTP/32/real-4               5.00 ± 0%
ServeHTTP/32/integer-4            5.00 ± 0%
ServeHTTP/32/histogram5-4         10.0 ± 0%
ServeHTTP/32/label5-4             5.00 ± 0%
ServeHTTP/32/label2x3x5-4         6.00 ± 0%
ServeHTTP/32/sample-4             5.00 ± 0%
ServeHTTP/1024/counter-4          5.00 ± 0%
ServeHTTP/1024/real-4             5.00 ± 0%
ServeHTTP/1024/integer-4          5.00 ± 0%
ServeHTTP/1024/histogram5-4       10.0 ± 0%
ServeHTTP/1024/label5-4           5.00 ± 0%
ServeHTTP/1024/label2x3x5-4       5.00 ± 0%
ServeHTTP/1024/sample-4           5.00 ± 0%
ServeHTTP/32768/counter-4         5.00 ± 0%
ServeHTTP/32768/real-4            5.00 ± 0%
ServeHTTP/32768/integer-4         5.00 ± 0%
ServeHTTP/32768/histogram5-4      10.0 ± 0%
ServeHTTP/32768/label5-4          5.00 ± 0%
ServeHTTP/32768/label2x3x5-4      5.00 ± 0%
ServeHTTP/32768/sample-4          5.00 ± 0%

name                          speed
ServeHTTP/32/counter-4        1.75GB/s ± 0%
ServeHTTP/32/real-4            754MB/s ± 1%
ServeHTTP/32/integer-4        1.67GB/s ± 1%
ServeHTTP/32/histogram5-4      878MB/s ± 0%
ServeHTTP/32/label5-4          889MB/s ± 1%
ServeHTTP/32/label2x3x5-4     1.14GB/s ± 2%
ServeHTTP/32/sample-4          625MB/s ± 1%
ServeHTTP/1024/counter-4      2.03GB/s ± 1%
ServeHTTP/1024/real-4          914MB/s ± 2%
ServeHTTP/1024/integer-4      1.94GB/s ± 1%
ServeHTTP/1024/histogram5-4    946MB/s ± 1%
ServeHTTP/1024/label5-4       1.06GB/s ± 4%
ServeHTTP/1024/label2x3x5-4   1.38GB/s ± 3%
ServeHTTP/1024/sample-4        735MB/s ± 3%
ServeHTTP/32768/counter-4     1.92GB/s ± 1%
ServeHTTP/32768/real-4         929MB/s ± 1%
ServeHTTP/32768/integer-4     1.83GB/s ± 4%
ServeHTTP/32768/histogram5-4   690MB/s ± 2%
ServeHTTP/32768/label5-4       921MB/s ± 1%
ServeHTTP/32768/label2x3x5-4  1.21GB/s ± 4%
ServeHTTP/32768/sample-4       742MB/s ± 5%

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