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[chore] Simplify the OTEL setup (#4110)

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# Description

This simplifies our OTEL setup by:

* Getting rid of some deprecated things.
* Using `autoexport` and letting things get configured by the `OTEL_` environment variables.
* Removing all the unnecessary config options.

## 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.
- [ ] 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`.

Reviewed-on: https://codeberg.org/superseriousbusiness/gotosocial/pulls/4110
Reviewed-by: tobi <kipvandenbos@noreply.codeberg.org>
Co-authored-by: Daenney <daenney@noreply.codeberg.org>
Co-committed-by: Daenney <daenney@noreply.codeberg.org>
This commit is contained in:
Daenney 2025-05-05 16:22:45 +00:00 • committed by tobi
commit ecbdc4227b
145 changed files with 21740 additions and 1319 deletions
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# STDOUT Metric Exporter
[![PkgGoDev](https://pkg.go.dev/badge/go.opentelemetry.io/otel/exporters/stdout/stdoutmetric)](https://pkg.go.dev/go.opentelemetry.io/otel/exporters/stdout/stdoutmetric)

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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
package stdoutmetric // import "go.opentelemetry.io/otel/exporters/stdout/stdoutmetric"
import (
"encoding/json"
"io"
"os"
"go.opentelemetry.io/otel/sdk/metric"
)
// config contains options for the exporter.
type config struct {
prettyPrint bool
encoder *encoderHolder
temporalitySelector metric.TemporalitySelector
aggregationSelector metric.AggregationSelector
redactTimestamps bool
}
// newConfig creates a validated config configured with options.
func newConfig(options ...Option) config {
cfg := config{}
for _, opt := range options {
cfg = opt.apply(cfg)
}
if cfg.encoder == nil {
enc := json.NewEncoder(os.Stdout)
cfg.encoder = &encoderHolder{encoder: enc}
}
if cfg.prettyPrint {
if e, ok := cfg.encoder.encoder.(*json.Encoder); ok {
e.SetIndent("", "\t")
}
}
if cfg.temporalitySelector == nil {
cfg.temporalitySelector = metric.DefaultTemporalitySelector
}
if cfg.aggregationSelector == nil {
cfg.aggregationSelector = metric.DefaultAggregationSelector
}
return cfg
}
// Option sets exporter option values.
type Option interface {
apply(config) config
}
type optionFunc func(config) config
func (o optionFunc) apply(c config) config {
return o(c)
}
// WithEncoder sets the exporter to use encoder to encode all the metric
// data-types to an output.
func WithEncoder(encoder Encoder) Option {
return optionFunc(func(c config) config {
if encoder != nil {
c.encoder = &encoderHolder{encoder: encoder}
}
return c
})
}
// WithWriter sets the export stream destination.
// Using this option overrides any previously set encoder.
func WithWriter(w io.Writer) Option {
return WithEncoder(json.NewEncoder(w))
}
// WithPrettyPrint prettifies the emitted output.
// This option only works if the encoder is a *json.Encoder, as is the case
// when using `WithWriter`.
func WithPrettyPrint() Option {
return optionFunc(func(c config) config {
c.prettyPrint = true
return c
})
}
// WithTemporalitySelector sets the TemporalitySelector the exporter will use
// to determine the Temporality of an instrument based on its kind. If this
// option is not used, the exporter will use the DefaultTemporalitySelector
// from the go.opentelemetry.io/otel/sdk/metric package.
func WithTemporalitySelector(selector metric.TemporalitySelector) Option {
return temporalitySelectorOption{selector: selector}
}
type temporalitySelectorOption struct {
selector metric.TemporalitySelector
}
func (t temporalitySelectorOption) apply(c config) config {
c.temporalitySelector = t.selector
return c
}
// WithAggregationSelector sets the AggregationSelector the exporter will use
// to determine the aggregation to use for an instrument based on its kind. If
// this option is not used, the exporter will use the
// DefaultAggregationSelector from the go.opentelemetry.io/otel/sdk/metric
// package or the aggregation explicitly passed for a view matching an
// instrument.
func WithAggregationSelector(selector metric.AggregationSelector) Option {
return aggregationSelectorOption{selector: selector}
}
type aggregationSelectorOption struct {
selector metric.AggregationSelector
}
func (t aggregationSelectorOption) apply(c config) config {
c.aggregationSelector = t.selector
return c
}
// WithoutTimestamps sets all timestamps to zero in the output stream.
func WithoutTimestamps() Option {
return optionFunc(func(c config) config {
c.redactTimestamps = true
return c
})
}

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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
// Package stdoutmetric provides an exporter for OpenTelemetry metric
// telemetry.
//
// The exporter is intended to be used for testing and debugging, it is not
// meant for production use. Additionally, it does not provide an interchange
// format for OpenTelemetry that is supported with any stability or
// compatibility guarantees. If these are needed features, please use the OTLP
// exporter instead.
package stdoutmetric // import "go.opentelemetry.io/otel/exporters/stdout/stdoutmetric"

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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
package stdoutmetric // import "go.opentelemetry.io/otel/exporters/stdout/stdoutmetric"
import (
"errors"
)
// Encoder encodes and outputs OpenTelemetry metric data-types as human
// readable text.
type Encoder interface {
// Encode handles the encoding and writing of OpenTelemetry metric data.
Encode(v any) error
}
// encoderHolder is the concrete type used to wrap an Encoder so it can be
// used as a atomic.Value type.
type encoderHolder struct {
encoder Encoder
}
func (e encoderHolder) Encode(v any) error { return e.encoder.Encode(v) }
// shutdownEncoder is used when the exporter is shutdown. It always returns
// errShutdown when Encode is called.
type shutdownEncoder struct{}
var errShutdown = errors.New("exporter shutdown")
func (shutdownEncoder) Encode(any) error { return errShutdown }

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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
package stdoutmetric // import "go.opentelemetry.io/otel/exporters/stdout/stdoutmetric"
import (
"context"
"errors"
"fmt"
"sync"
"sync/atomic"
"go.opentelemetry.io/otel/internal/global"
"go.opentelemetry.io/otel/sdk/metric"
"go.opentelemetry.io/otel/sdk/metric/metricdata"
)
// exporter is an OpenTelemetry metric exporter.
type exporter struct {
encVal atomic.Value // encoderHolder
shutdownOnce sync.Once
temporalitySelector metric.TemporalitySelector
aggregationSelector metric.AggregationSelector
redactTimestamps bool
}
// New returns a configured metric exporter.
//
// If no options are passed, the default exporter returned will use a JSON
// encoder with tab indentations that output to STDOUT.
func New(options ...Option) (metric.Exporter, error) {
cfg := newConfig(options...)
exp := &exporter{
temporalitySelector: cfg.temporalitySelector,
aggregationSelector: cfg.aggregationSelector,
redactTimestamps: cfg.redactTimestamps,
}
exp.encVal.Store(*cfg.encoder)
return exp, nil
}
func (e *exporter) Temporality(k metric.InstrumentKind) metricdata.Temporality {
return e.temporalitySelector(k)
}
func (e *exporter) Aggregation(k metric.InstrumentKind) metric.Aggregation {
return e.aggregationSelector(k)
}
func (e *exporter) Export(ctx context.Context, data *metricdata.ResourceMetrics) error {
if err := ctx.Err(); err != nil {
return err
}
if e.redactTimestamps {
redactTimestamps(data)
}
global.Debug("STDOUT exporter export", "Data", data)
return e.encVal.Load().(encoderHolder).Encode(data)
}
func (e *exporter) ForceFlush(context.Context) error {
// exporter holds no state, nothing to flush.
return nil
}
func (e *exporter) Shutdown(context.Context) error {
e.shutdownOnce.Do(func() {
e.encVal.Store(encoderHolder{
encoder: shutdownEncoder{},
})
})
return nil
}
func (e *exporter) MarshalLog() interface{} {
return struct{ Type string }{Type: "STDOUT"}
}
func redactTimestamps(orig *metricdata.ResourceMetrics) {
for i, sm := range orig.ScopeMetrics {
metrics := sm.Metrics
for j, m := range metrics {
data := m.Data
orig.ScopeMetrics[i].Metrics[j].Data = redactAggregationTimestamps(data)
}
}
}
var errUnknownAggType = errors.New("unknown aggregation type")
func redactAggregationTimestamps(orig metricdata.Aggregation) metricdata.Aggregation {
switch a := orig.(type) {
case metricdata.Sum[float64]:
return metricdata.Sum[float64]{
Temporality: a.Temporality,
DataPoints: redactDataPointTimestamps(a.DataPoints),
IsMonotonic: a.IsMonotonic,
}
case metricdata.Sum[int64]:
return metricdata.Sum[int64]{
Temporality: a.Temporality,
DataPoints: redactDataPointTimestamps(a.DataPoints),
IsMonotonic: a.IsMonotonic,
}
case metricdata.Gauge[float64]:
return metricdata.Gauge[float64]{
DataPoints: redactDataPointTimestamps(a.DataPoints),
}
case metricdata.Gauge[int64]:
return metricdata.Gauge[int64]{
DataPoints: redactDataPointTimestamps(a.DataPoints),
}
case metricdata.Histogram[int64]:
return metricdata.Histogram[int64]{
Temporality: a.Temporality,
DataPoints: redactHistogramTimestamps(a.DataPoints),
}
case metricdata.Histogram[float64]:
return metricdata.Histogram[float64]{
Temporality: a.Temporality,
DataPoints: redactHistogramTimestamps(a.DataPoints),
}
default:
global.Error(errUnknownAggType, fmt.Sprintf("%T", a))
return orig
}
}
func redactHistogramTimestamps[T int64 | float64](hdp []metricdata.HistogramDataPoint[T]) []metricdata.HistogramDataPoint[T] {
out := make([]metricdata.HistogramDataPoint[T], len(hdp))
for i, dp := range hdp {
out[i] = metricdata.HistogramDataPoint[T]{
Attributes: dp.Attributes,
Count: dp.Count,
Sum: dp.Sum,
Bounds: dp.Bounds,
BucketCounts: dp.BucketCounts,
Min: dp.Min,
Max: dp.Max,
}
}
return out
}
func redactDataPointTimestamps[T int64 | float64](sdp []metricdata.DataPoint[T]) []metricdata.DataPoint[T] {
out := make([]metricdata.DataPoint[T], len(sdp))
for i, dp := range sdp {
out[i] = metricdata.DataPoint[T]{
Attributes: dp.Attributes,
Value: dp.Value,
}
}
return out
}