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Programming language: Go
License: GNU General Public License v3.0 or later
Tags:
Miscellaneous
Strings
Latest version: v1.2.0
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README
About
Atomic measures with Prometheus exposition for the Go programming language.
This is free and unencumbered software released into the public domain.
Use
import "github.com/pascaldekloe/metrics"
func main() {
// mount exposition point
http.HandleFunc("/metrics", metrics.ServeHTTP)
// good to go…
}
The registration functions require no further configuration.
// Package Metrics
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) and
DiskUsage(dev.Name).Set(1 - dev.Free, time.Now()). The result may
look like the following.
< HTTP/1.1 200 OK
< Content-Type: text/plain; version=0.0.4; charset=UTF-8
< Date: Fri, 21 Feb 2020 12:45:12 GMT
< Content-Length: 351
<
# Prometheus Samples
# TYPE db_connects_total counter
# HELP db_connects_total Number of established initiations.
db_connects_total 4 1582289112766
# TYPE db_cache_bytes gauge
# HELP db_cache_bytes Size of collective responses.
db_cache_bytes 7600 1582289112766
# TYPE db_disk_usage_ratio gauge
# HELP db_disk_usage_ratio Sectors of the total capacity.
db_disk_usage_ratio{device="sda"} 0.19 1582289097555
Package github.com/pascaldekloe/metrics/gostat provides a defacto standard
collection of Go metrics, similar to the setup from the
original Prometheus library.
// include default metrics (optional)
gostat.CaptureEvery(time.Minute)
Performance
The following benchmarks were measured on a 3.5 GHz Xeon from the year 2013.
name time/op
Label/sequential/4-12 20.6ns ± 0%
Label/sequential/4x4-12 25.1ns ± 0%
Label/sequential/4x4x4-12 46.2ns ± 1%
Label/parallel/4-12 100ns ± 0%
Label/parallel/4x4-12 119ns ± 0%
Label/parallel/4x4x4-12 155ns ± 0%
Get/histogram5/sequential-12 105ns ± 0%
Get/histogram5/2routines-12 140ns ± 0%
Set/real/sequential-12 5.71ns ± 0%
Set/real/2routines-12 14.5ns ±32%
Set/sample/sequential-12 33.0ns ± 0%
Set/sample/2routines-12 42.4ns ± 1%
Add/counter/sequential-12 5.71ns ± 0%
Add/counter/2routines-12 16.2ns ±22%
Add/integer/sequential-12 5.70ns ± 0%
Add/integer/2routines-12 16.7ns ±19%
Add/histogram5/sequential-12 29.7ns ± 0%
Add/histogram5/2routines-12 71.5ns ±11%
ServeHTTP/32/counter-12 2.08µs ± 0%
ServeHTTP/32/real-12 3.42µs ± 0%
ServeHTTP/32/integer-12 2.09µs ± 0%
ServeHTTP/32/histogram5-12 11.9µs ± 0%
ServeHTTP/32/label5-12 3.92µs ± 1%
ServeHTTP/32/label2x3x5-12 3.98µs ± 1%
ServeHTTP/32/sample-12 3.45µs ± 0%
ServeHTTP/1024/counter-12 41.2µs ± 1%
ServeHTTP/1024/real-12 81.1µs ± 3%
ServeHTTP/1024/integer-12 43.0µs ± 2%
ServeHTTP/1024/histogram5-12 342µs ± 1%
ServeHTTP/1024/label5-12 97.7µs ± 4%
ServeHTTP/1024/label2x3x5-12 98.2µs ± 3%
ServeHTTP/1024/sample-12 82.4µs ± 1%
ServeHTTP/32768/counter-12 1.36ms ± 3%
ServeHTTP/32768/real-12 2.63ms ± 4%
ServeHTTP/32768/integer-12 1.36ms ± 2%
ServeHTTP/32768/histogram5-12 12.1ms ± 1%
ServeHTTP/32768/label5-12 3.35ms ± 1%
ServeHTTP/32768/label2x3x5-12 3.44ms ± 1%
ServeHTTP/32768/sample-12 2.73ms ± 1%
name speed
ServeHTTP/32/counter-12 934MB/s ± 0%
ServeHTTP/32/real-12 494MB/s ± 0%
ServeHTTP/32/integer-12 900MB/s ± 0%
ServeHTTP/32/histogram5-12 728MB/s ± 0%
ServeHTTP/32/label5-12 619MB/s ± 1%
ServeHTTP/32/label2x3x5-12 795MB/s ± 1%
ServeHTTP/32/sample-12 489MB/s ± 0%
ServeHTTP/1024/counter-12 1.59GB/s ± 1%
ServeHTTP/1024/real-12 705MB/s ± 3%
ServeHTTP/1024/integer-12 1.47GB/s ± 2%
ServeHTTP/1024/histogram5-12 836MB/s ± 1%
ServeHTTP/1024/label5-12 826MB/s ± 4%
ServeHTTP/1024/label2x3x5-12 1.06GB/s ± 3%
ServeHTTP/1024/sample-12 693MB/s ± 1%
ServeHTTP/32768/counter-12 1.67GB/s ± 3%
ServeHTTP/32768/real-12 760MB/s ± 3%
ServeHTTP/32768/integer-12 1.61GB/s ± 2%
ServeHTTP/32768/histogram5-12 793MB/s ± 1%
ServeHTTP/32768/label5-12 821MB/s ± 1%
ServeHTTP/32768/label2x3x5-12 1.02GB/s ± 1%
ServeHTTP/32768/sample-12 732MB/s ± 1%