Transports
A transport is what actually emits a log entry: to stdout, to a file, to a third-party logger like zerolog or zap, to a remote service. The core LogLayer assembles the entry; the transport renders it.
Available transports
Renderers
Self-contained transports that format the entry and write it to an io.Writer. Pick one of these when you want LogLayer to do the rendering itself.
| Name | Version | Go Reference | Description |
|---|---|---|---|
| Blank |  |  | Delegates dispatch to a user-supplied function. For prototyping or one-off integrations. |
| CLI |  |  | Tuned for CLI apps: short level prefixes, stdout/stderr routing, TTY-detected color, no timestamps. |
| Console |  |  | Plain fmt.Println-style output to stdout/stderr; minimal formatting. |
| Pretty |  |  | Colorized, theme-aware terminal output. Recommended for local dev. |
| Structured |  |  | One JSON object per log entry. Recommended for production. |
| Testing |  |  | Captures entries in memory for tests. |
Cloud
Managed log services. Async + batched by default; site-aware where applicable.
| Name | Version | Go Reference | Description |
|---|---|---|---|
| Axiom |  |  | Ships logs to Axiom via caller-supplied *axiom.Client. NDJSON ingestion with configurable message field. |
| Better Stack |  |  | Ships logs to Better Stack via HTTP intake. Source token auth, configurable timestamp field. |
| Datadog |  |  | Datadog Logs HTTP intake. Site-aware URL, DD-API-KEY header, status mapping. |
| Google Cloud Logging |  |  | Forwards entries to a caller-supplied *logging.Logger from cloud.google.com/go/logging. Severity mapping, root-level Entry skeleton, async + sync dispatch. |
| New Relic |  |  | New Relic Log Ingest API. Site-aware URL, api-key header, LogEvent encoding. |
| Sentry |  |  | Forwards entries to a sentry.Logger. Routes fatal/panic through LFatal so loglayer's core controls termination. |
Other Transports
Generic shippers and on-disk sinks.
| Name | Version | Go Reference | Description |
|---|---|---|---|
| File (Lumberjack) |  |  | One JSON object per line written to a rotating file. Backed by lumberjack.v2. |
| HTTP |  |  | Generic batched HTTP POST to any endpoint. Pluggable Encoder. |
| OpenTelemetry Logs |  |  | Emits to an OTel log.Logger. Forwards WithContext so SDK processors can correlate with the active span. |
Supported Loggers
Transports that hand the entry off to an existing third-party logger you already configure. Pick one of these when you have an established logging stack and want LogLayer's API on top.
| Name | Version | Go Reference | Description |
|---|---|---|---|
| charmbracelet/log |  |  | Pretty terminal-friendly logger from Charm |
| log/slog |  |  | Wraps a stdlib *slog.Logger. Forwards WithContext to handlers. |
| logrus |  |  | The classic structured logger |
| phuslu/log |  |  | High-performance zero-alloc JSON logger. Always exits on fatal. |
| Zap |  |  | Wraps a *zap.Logger |
| Zerolog |  |  | Wraps a *zerolog.Logger |
A single LogLayer can fan out to several transports at once, see Multiple Transports. To wrap a logger LogLayer doesn't ship a transport for, see Creating Transports.