logger_provider_file: Logger provider to write log messages into a JSONL file.

In otelsdk: 'R' 'SDK' and Exporters for 'OpenTelemetry'

Logger provider to write log messages into a JSONL file.

Description

This is the OTLP file exporter. It writes logs to a JSONL file, each log is a line in the file, a valid JSON value. The line separator is ⁠\n⁠. The preferred file extension is jsonl.

Select this tracer provider with OTEL_LOGS_EXPORTER=otlp/file.

Value

logger_provider_file$new() returns an otel::otel_logger_provider object.

logger_provider_file$options() returns a named list, the current values of the options.

Usage

Externally:

OTEL_LOGS_EXPORTER=otlp/file

From R:

logger_provider_file$new(opts = NULL)
logger_provider_file$options()

Arguments

• opts: Named list of options. See below.

Options

File exporter options

• file_pattern: Output file pattern. Value is set from:

  • opts argument, or

  • OTEL_EXPORTER_OTLP_LOGS_FILE environment variable, or

  • OTEL_EXPORTER_OTLP_FILE environment variable, or

  • the default is: ⁠logs-%N.jsonl⁠.

  May contain placeholders, see below.

• alias_pattern: The file which always point to the latest file. Value is set from:

  • opts argument, or

  • OTEL_EXPORTER_OTLP_LOGS_FILE_ALIAS environment variable, or

  • ⁠OTEL_EXPORTER_OTLP_FILE_ALIAS environment variable⁠, or

  • the default is: logs-latest.jsonl.

  May contain placeholders, see below.

• flush_interval: Interval to force flush output. A time interval specification, see Time Interval Options. Value is set from

  • opts argument, or

  • OTEL_EXPORTER_OTLP_LOGS_FILE_FLUSH_INTERVAL environment variable, or

  • OTEL_EXPORTER_OTLP_FILE_FLUSH_INTERVAL environment variable, or

  • the default is ⁠30s⁠, thirty seconds.

• flush_count: Force flush output after every flush_count records. Value is set from

  • opts argument, or

  • OTEL_EXPORTER_OTLP_LOGS_FILE_FLUSH_COUNT environment variable, or

  • OTEL_EXPORTER_OTLP_FILE_FLUSH_COUNT environment variable, or

  • the default is 256.

• file_size: File size to rotate output files. A file size specification, see File Size Options. Value is set from

  • opts argument, or

  • OTEL_EXPORTER_OTLP_LOGS_FILE_FILE_SIZE environment variable, or

  • OTEL_EXPORTER_OTLP_FILE_FILE_SIZE environment variable, or

  • the default is ⁠20MB⁠.

• rotate_size: How many rotated output files to keep. Value is set from

  • opts argument, or

  • OTEL_EXPORTER_OTLP_LOGS_FILE_ROTATE_SIZE environment variable, or

  • OTEL_EXPORTER_OTLP_FILE_ROTATE_SIZE environment variable, or

  • the default is 10.

Special placeholders are available for file_pattern and alias_pattern:

• ⁠%Y⁠: Writes year as a 4 digit decimal number.

• ⁠%y⁠: Writes last 2 digits of year as a decimal number (range ⁠[00,99]⁠).

• ⁠%m⁠: Writes month as a decimal number (range ⁠[01,12]⁠).

• ⁠%j⁠: Writes day of the year as a decimal number (range ⁠[001,366]⁠).

• ⁠%d⁠: Writes day of the month as a decimal number (range ⁠[01,31]⁠).

• ⁠%w⁠: Writes weekday as a decimal number, where Sunday is 0 (range ⁠[0-6]⁠).

• ⁠%H⁠: Writes hour as a decimal number, 24 hour clock (range ⁠[00-23]⁠).

• ⁠%I⁠: Writes hour as a decimal number, 12 hour clock (range ⁠[01,12]⁠).

• ⁠%M⁠: Writes minute as a decimal number (range ⁠[00,59]⁠).

• ⁠%S⁠: Writes second as a decimal number (range ⁠[00,60]⁠).

• ⁠%F⁠: Equivalent to ⁠%Y-%m-%d⁠ (the ISO 8601 date format).

• ⁠%T⁠: Equivalent to ⁠%H:%M:%S⁠ (the ISO 8601 time format).

• ⁠%R⁠: Equivalent to ⁠%H:%M⁠.

• ⁠%N⁠: Rotate index, start from 0.

• ⁠%n⁠: Rotate index, start from 1.

Examples

logger_provider_file$options()

otelsdk documentation built on Sept. 10, 2025, 10:32 a.m.