Module `Message_templates.File_sink`

File sink - outputs log events to a file with optional rolling

The file sink writes log events to files on disk with support for automatic log rotation based on time intervals.

Rolling intervals:

Infinite: Never roll (single file)
Daily: Create new file each day (appends -YYYYMMDD to filename)
Hourly: Create new file each hour (appends -YYYYMMDDHH to filename)

type rolling_interval =

| Infinite
(*
Never roll, single log file
*)
| Daily
(*
Roll daily at midnight UTC
*)
| Hourly
(*
Roll at the start of each hour
*)

type t

File sink type (opaque)

val default_template : string

Default file output template: "{timestamp} [{level}] {message}"

val create : 
  ?output_template:string ->
  ?rolling:rolling_interval ->
  string ->
  t

Create a file sink.

parameter output_template
Output template with placeholders

parameter rolling
Rolling interval for log rotation (default: Infinite)

parameter path
Base file path for log files

val emit : t -> Log_event.t -> unit

Emit a log event to the file

val flush : t -> unit

Flush the file buffer

val close : t -> unit

Close the file sink and underlying channel