Setting the file. One moment.
Subchapter 152.3
references/go.mdMarkdown4 KBView on GitHub
Required
Terminal
PostHog AI
go get go.opentelemetry.io/otel/sdk/log
go get go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploghttp2
Required
You’ll need your PostHog project token to authenticate log requests. This is the same key you use for capturing events and exceptions with the PostHog SDK.
Important: Use your project token which starts with
phc_. Do not use a personal API key (which starts withphx_).
You can find your project token in Project Settings (opens in a new tab).
3
Required
Set up the OpenTelemetry SDK to send logs to PostHog.
Go
PostHog AI
package main
import (
"os"
"context"
"log"
"log/slog"
"go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploghttp"
"go.opentelemetry.io/otel/exporters/stdout/stdoutlog"
"go.opentelemetry.io/contrib/bridges/otelslog"
otellog "go.opentelemetry.io/otel/sdk/log"
"go.opentelemetry.io/otel/log/global"
)
func main() {
ctx := context.Background()
// Create OTLP HTTP exporter
exporter, err := otlploghttp.New(ctx,
otlploghttp.WithEndpoint("us.i.posthog.com"),
otlploghttp.WithURLPath("/i/v1/logs"),
otlploghttp.WithHeaders(map[string]string{
"Authorization": "Bearer <ph_project_token>",
}),
)
if err != nil {
panic(err)
}
// you could also set this outside your application
os.Setenv("OTEL_SERVICE_NAME", "my-service")
stdoutExporter, _ := stdoutlog.New()
// Create logger provider
loggerProvider := otellog.NewLoggerProvider(
otellog.WithProcessor(otellog.NewBatchProcessor(exporter)),
// optional, also log to stdout
otellog.WithProcessor(otellog.NewSimpleProcessor(stdoutExporter)),
)
defer func() {
loggerProvider.Shutdown(context.Background())
}()
global.SetLoggerProvider(loggerProvider)
slog.SetDefault(otelslog.NewLogger(""))
log.Println("this is a log line")
}Alternatively, you can pass the API key as a query parameter by modifying the URL path:
Go
PostHog AI
otlploghttp.WithURLPath("/i/v1/logs?token=<ph_project_token>")4
Required
Now you can start logging with OpenTelemetry:
Go
PostHog AI
import (
"go.opentelemetry.io/otel/log"
)
logger := otel.GetLoggerProvider().Logger("my-app")
logger.Info(ctx, "User action",
log.String("userId", "123"),
log.String("action", "login"),
)5
Recommended
Once everything is configured, test that logs are flowing into PostHog:
Checkpoint
What you can do with your logs
| Action | Description |
|---|---|
| Why you need logs (opens in a new tab) | What logs show you that nothing else does |
| Search logs (opens in a new tab) | Use the search interface to find specific log entries |
| Filter by level | Filter by INFO, WARN, ERROR, etc. |
| Link session replay (opens in a new tab) | Connect logs to users and session replays by passing posthogDistinctId and sessionId |
| Logging best practices (opens in a new tab) | Learn what to log, how to structure logs, and patterns that make logs useful in production |
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