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[chore/docs] Fix Prometheus metric names for Gin, include example Grafana dash, update docs (#4443)

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# Description

> If this is a code change, please include a summary of what you've coded, and link to the issue(s) it closes/implements.
>
> If this is a documentation change, please briefly describe what you've changed and why.

This pull request updates some of our inconsistent metric naming, and adds an example Grafana dashboard using all the most up-to-date metrics names, and updates our docs to describe the latest way of setting up metrics.

Closes https://codeberg.org/superseriousbusiness/gotosocial/issues/4362
Closes https://codeberg.org/superseriousbusiness/gotosocial/issues/4055

## Checklist

Please put an x inside each checkbox to indicate that you've read and followed it: `[ ]` -> `[x]`

If this is a documentation change, only the first checkbox must be filled (you can delete the others if you want).

- [x] I/we have read the [GoToSocial contribution guidelines](https://codeberg.org/superseriousbusiness/gotosocial/src/branch/main/CONTRIBUTING.md).
- [x] I/we have discussed the proposed changes already, either in an issue on the repository, or in the Matrix chat.
- [x] I/we have not leveraged AI to create the proposed changes.
- [x] I/we have performed a self-review of added code.
- [x] I/we have written code that is legible and maintainable by others.
- [x] I/we have commented the added code, particularly in hard-to-understand areas.
- [x] I/we have made any necessary changes to documentation.
- [ ] I/we have added tests that cover new code.
- [x] I/we have run tests and they pass locally with the changes.
- [x] I/we have run `go fmt ./...` and `golangci-lint run`.

Co-authored-by: kim <grufwub@gmail.com>
Reviewed-on: https://codeberg.org/superseriousbusiness/gotosocial/pulls/4443
Reviewed-by: kim <gruf@noreply.codeberg.org>
Co-authored-by: tobi <tobi.smethurst@protonmail.com>
Co-committed-by: tobi <tobi.smethurst@protonmail.com>
This commit is contained in:
tobi 2025-09-18 16:48:45 +02:00 • committed by tobi
commit 82216281ce
32 changed files with 2315 additions and 4760 deletions
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45
vendor/github.com/technologize/otel-go-contrib/otelginmetrics/config.go generated vendored
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@ -1,45 +0,0 @@
package otelginmetrics
import (
"net/http"
"go.opentelemetry.io/otel/attribute"
semconv "go.opentelemetry.io/otel/semconv/v1.7.0"
)
type config struct {
recordInFlight bool
recordSize bool
recordDuration bool
groupedStatus bool
recorder Recorder
attributes func(serverName, route string, request *http.Request) []attribute.KeyValue
shouldRecord func(serverName, route string, request *http.Request) bool
}
func defaultConfig() *config {
return &config{
recordInFlight: true,
recordDuration: true,
recordSize: true,
groupedStatus: true,
attributes: DefaultAttributes,
shouldRecord: func(_, _ string, _ *http.Request) bool {
return true
},
}
}
var DefaultAttributes = func(serverName, route string, request *http.Request) []attribute.KeyValue {
attrs := []attribute.KeyValue{
semconv.HTTPMethodKey.String(request.Method),
}
if serverName != "" {
attrs = append(attrs, semconv.HTTPServerNameKey.String(serverName))
}
if route != "" {
attrs = append(attrs, semconv.HTTPRouteKey.String(route))
}
return attrs
}

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vendor/github.com/technologize/otel-go-contrib/otelginmetrics/middleware.go generated vendored
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@ -1,94 +0,0 @@
package otelginmetrics
import (
"net/http"
"time"
"github.com/gin-gonic/gin"
semconv "go.opentelemetry.io/otel/semconv/v1.7.0"
)
// Middleware returns middleware that will trace incoming requests.
// The service parameter should describe the name of the (virtual)
// server handling the request.
func Middleware(service string, options ...Option) gin.HandlerFunc {
cfg := defaultConfig()
for _, option := range options {
option.apply(cfg)
}
recorder := cfg.recorder
if recorder == nil {
recorder = GetRecorder("")
}
return func(ginCtx *gin.Context) {
ctx := ginCtx.Request.Context()
route := ginCtx.FullPath()
if len(route) <= 0 {
route = "nonconfigured"
}
if !cfg.shouldRecord(service, route, ginCtx.Request) {
ginCtx.Next()
return
}
start := time.Now()
reqAttributes := cfg.attributes(service, route, ginCtx.Request)
if cfg.recordInFlight {
recorder.AddInflightRequests(ctx, 1, reqAttributes)
defer recorder.AddInflightRequests(ctx, -1, reqAttributes)
}
defer func() {
resAttributes := append(reqAttributes[0:0], reqAttributes...)
if cfg.groupedStatus {
code := int(ginCtx.Writer.Status()/100) * 100
resAttributes = append(resAttributes, semconv.HTTPStatusCodeKey.Int(code))
} else {
resAttributes = append(resAttributes, semconv.HTTPAttributesFromHTTPStatusCode(ginCtx.Writer.Status())...)
}
recorder.AddRequests(ctx, 1, resAttributes)
if cfg.recordSize {
requestSize := computeApproximateRequestSize(ginCtx.Request)
recorder.ObserveHTTPRequestSize(ctx, requestSize, resAttributes)
recorder.ObserveHTTPResponseSize(ctx, int64(ginCtx.Writer.Size()), resAttributes)
}
if cfg.recordDuration {
recorder.ObserveHTTPRequestDuration(ctx, time.Since(start), resAttributes)
}
}()
ginCtx.Next()
}
}
func computeApproximateRequestSize(r *http.Request) int64 {
s := 0
if r.URL != nil {
s = len(r.URL.Path)
}
s += len(r.Method)
s += len(r.Proto)
for name, values := range r.Header {
s += len(name)
for _, value := range values {
s += len(value)
}
}
s += len(r.Host)
// N.B. r.Form and r.MultipartForm are assumed to be included in r.URL.
if r.ContentLength != -1 {
s += int(r.ContentLength)
}
return int64(s)
}

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vendor/github.com/technologize/otel-go-contrib/otelginmetrics/option.go generated vendored
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@ -1,74 +0,0 @@
package otelginmetrics
import (
"net/http"
"go.opentelemetry.io/otel/attribute"
)
// Option applies a configuration to the given config
type Option interface {
apply(cfg *config)
}
type optionFunc func(cfg *config)
func (fn optionFunc) apply(cfg *config) {
fn(cfg)
}
// WithAttributes sets a func using which what attributes to be recorded can be specified.
// By default the DefaultAttributes is used
func WithAttributes(attributes func(serverName, route string, request *http.Request) []attribute.KeyValue) Option {
return optionFunc(func(cfg *config) {
cfg.attributes = attributes
})
}
// WithRecordInFlight determines whether to record In Flight Requests or not
// By default the recordInFlight is true
func WithRecordInFlightDisabled() Option {
return optionFunc(func(cfg *config) {
cfg.recordInFlight = false
})
}
// WithRecordDuration determines whether to record Duration of Requests or not
// By default the recordDuration is true
func WithRecordDurationDisabled() Option {
return optionFunc(func(cfg *config) {
cfg.recordDuration = false
})
}
// WithRecordSize determines whether to record Size of Requests and Responses or not
// By default the recordSize is true
func WithRecordSizeDisabled() Option {
return optionFunc(func(cfg *config) {
cfg.recordSize = false
})
}
// WithGroupedStatus determines whether to group the response status codes or not. If true 2xx, 3xx will be stored
// By default the groupedStatus is true
func WithGroupedStatusDisabled() Option {
return optionFunc(func(cfg *config) {
cfg.groupedStatus = false
})
}
// WithRecorder sets a recorder for recording requests
// By default the open telemetry recorder is used
func WithRecorder(recorder Recorder) Option {
return optionFunc(func(cfg *config) {
cfg.recorder = recorder
})
}
// WithShouldRecordFunc sets a func using which whether a record should be recorded
// By default the all api calls are recorded
func WithShouldRecordFunc(shouldRecord func(serverName, route string, request *http.Request) bool) Option {
return optionFunc(func(cfg *config) {
cfg.shouldRecord = shouldRecord
})
}

70
vendor/github.com/technologize/otel-go-contrib/otelginmetrics/otelrecorder.go generated vendored
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@ -1,70 +0,0 @@
package otelginmetrics
import (
"context"
"time"
"go.opentelemetry.io/otel"
"go.opentelemetry.io/otel/attribute"
"go.opentelemetry.io/otel/metric"
)
const instrumentationName = "github.com/technologize/otel-go-contrib/otelginmetrics"
// Recorder knows how to record and measure the metrics. This
// has the required methods to be used with the HTTP
// middlewares.
type otelRecorder struct {
attemptsCounter metric.Int64UpDownCounter
totalDuration metric.Int64Histogram
activeRequestsCounter metric.Int64UpDownCounter
requestSize metric.Int64Histogram
responseSize metric.Int64Histogram
}
func GetRecorder(metricsPrefix string) Recorder {
metricName := func(metricName string) string {
if len(metricsPrefix) > 0 {
return metricsPrefix + "." + metricName
}
return metricName
}
meter := otel.Meter(instrumentationName, metric.WithInstrumentationVersion(SemVersion()))
attemptsCounter, _ := meter.Int64UpDownCounter(metricName("http.server.request_count"), metric.WithDescription("Number of Requests"), metric.WithUnit("Count"))
totalDuration, _ := meter.Int64Histogram(metricName("http.server.duration"), metric.WithDescription("Time Taken by request"), metric.WithUnit("Milliseconds"))
activeRequestsCounter, _ := meter.Int64UpDownCounter(metricName("http.server.active_requests"), metric.WithDescription("Number of requests inflight"), metric.WithUnit("Count"))
requestSize, _ := meter.Int64Histogram(metricName("http.server.request_content_length"), metric.WithDescription("Request Size"), metric.WithUnit("Bytes"))
responseSize, _ := meter.Int64Histogram(metricName("http.server.response_content_length"), metric.WithDescription("Response Size"), metric.WithUnit("Bytes"))
return &otelRecorder{
attemptsCounter: attemptsCounter,
totalDuration: totalDuration,
activeRequestsCounter: activeRequestsCounter,
requestSize: requestSize,
responseSize: responseSize,
}
}
// AddRequests increments the number of requests being processed.
func (r *otelRecorder) AddRequests(ctx context.Context, quantity int64, attributes []attribute.KeyValue) {
r.attemptsCounter.Add(ctx, quantity, metric.WithAttributes(attributes...))
}
// ObserveHTTPRequestDuration measures the duration of an HTTP request.
func (r *otelRecorder) ObserveHTTPRequestDuration(ctx context.Context, duration time.Duration, attributes []attribute.KeyValue) {
r.totalDuration.Record(ctx, int64(duration/time.Millisecond), metric.WithAttributes(attributes...))
}
// ObserveHTTPRequestSize measures the size of an HTTP request in bytes.
func (r *otelRecorder) ObserveHTTPRequestSize(ctx context.Context, sizeBytes int64, attributes []attribute.KeyValue) {
r.requestSize.Record(ctx, sizeBytes, metric.WithAttributes(attributes...))
}
// ObserveHTTPResponseSize measures the size of an HTTP response in bytes.
func (r *otelRecorder) ObserveHTTPResponseSize(ctx context.Context, sizeBytes int64, attributes []attribute.KeyValue) {
r.responseSize.Record(ctx, sizeBytes, metric.WithAttributes(attributes...))
}
// AddInflightRequests increments and decrements the number of inflight request being processed.
func (r *otelRecorder) AddInflightRequests(ctx context.Context, quantity int64, attributes []attribute.KeyValue) {
r.activeRequestsCounter.Add(ctx, quantity, metric.WithAttributes(attributes...))
}

25
vendor/github.com/technologize/otel-go-contrib/otelginmetrics/recorder.go generated vendored
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@ -1,25 +0,0 @@
package otelginmetrics
import (
"context"
"time"
"go.opentelemetry.io/otel/attribute"
)
type Recorder interface {
// AddRequests increments the number of requests being processed.
AddRequests(ctx context.Context, quantity int64, attributes []attribute.KeyValue)
// ObserveHTTPRequestDuration measures the duration of an HTTP request.
ObserveHTTPRequestDuration(ctx context.Context, duration time.Duration, attributes []attribute.KeyValue)
// ObserveHTTPRequestSize measures the size of an HTTP request in bytes.
ObserveHTTPRequestSize(ctx context.Context, sizeBytes int64, attributes []attribute.KeyValue)
// ObserveHTTPResponseSize measures the size of an HTTP response in bytes.
ObserveHTTPResponseSize(ctx context.Context, sizeBytes int64, attributes []attribute.KeyValue)
// AddInflightRequests increments and decrements the number of inflight request being processed.
AddInflightRequests(ctx context.Context, quantity int64, attributes []attribute.KeyValue)
}

11
vendor/github.com/technologize/otel-go-contrib/otelginmetrics/version.go generated vendored
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@ -1,11 +0,0 @@
package otelginmetrics
// Version is the current release version of the gin instrumentation.
func Version() string {
return "1.0.0"
}
// SemVersion is the semantic version to be supplied to tracer/meter creation.
func SemVersion() string {
return "semver:" + Version()
}