Logging Extension

This document describes Triton's logging extension. The logging extension enables the client to configure log settings during a Triton run. Triton reports "logging" in the extensions field of its Server Metadata.

HTTP/REST

In all JSON schemas shown in this document $number, $string, $boolean, $object and $array refer to the fundamental JSON types. #optional indicates an optional JSON field.

Triton exposes the logging endpoint at the following URL. The client may use HTTP GET request to retrieve the current log settings. A HTTP POST request will modify the log settings, and the endpoint will return the updated log settings on success or an error in the case of failure.

GET v2/logging

POST v2/logging

Log Setting Response JSON Object

A successful log setting request is indicated by a 200 HTTP status code. The response object, identified as $log_setting_response, is returned in the HTTP body for every successful log setting request.

$log_setting_response =
{
  $log_setting, ...
}

$log_setting = $string : $string | $boolean | $number

Each $log_setting JSON describes a “name”/”value” pair, where the “name” is the $string representation of the log setting and the “value” is a $string, $bool, or $number representation of the setting value. Currently, the following log settings are defined:

"log_file" : a $string log file location where the log outputs will be saved. If empty, log outputs are streamed to the console.
"log_info" : a $boolean parameter that controls whether the Triton server logs INFO level messages.
"log_warning" : a $boolean parameter that controls whether the Triton server logs WARNING level messages.
"log_error" : a $boolean parameter that controls whether the Triton server logs ERROR level messages.
"log_verbose_level" : a $number parameter that controls whether the Triton server outputs verbose messages of varying degrees. This value can be any integer >= 0. If "log_verbose_level" is 0, verbose logging will be disabled, and no verbose messages will be output by the Triton server. If "log_verbose_level" is 1, level 1 verbose messages will be output by the Triton server. If "log_verbose_level" is 2, the Triton server will output all verbose messages of level <= 2, etc. Attempting to set "log_verbose_level" to a number < 0 will result in an error.
"log_format" : a $string parameter that controls the format of Triton server log messages. There are currently 2 formats: "default" and "ISO8601".

Log Setting Response JSON Error Object

A failed log setting request will be indicated by an HTTP error status (typically 400). The HTTP body will contain a $log_setting_error_response object.

$log_setting_error_response =
{
  "error": $string
}

“error” : The descriptive message for the error.

Log Setting Request JSON Object

A log setting request is made with a HTTP POST to the logging endpoint. In the corresponding response, the HTTP body contains the response JSON. A successful request is indicated by a 200 HTTP status code.

The request object, identified as $log_setting_request must be provided in the HTTP body.

$log_setting_request =
{
  $log_setting, ...
}

When a $log_setting JSON is received (defined above), only the specified settings will be updated. Currently, the following log settings (described above) can be updated:

"log_info"
"log_warning"
"log_error"
"log_verbose_level"
"log_format"

Example Usage

The logging protocol extension can be invoked using the curl library in the following manner (assuming a Triton server is running at localhost:8000):

curl -s -w '\n%{http_code}\n' -d '{"log_verbose_level":1}' -X POST localhost:8000/v2/logging

This command should return a $log_setting_response JSON object with the following format:

{"log_file":"","log_info":true,"log_warnings":true,"log_errors":true,"log_verbose_level":1,"log_format":"default"}
200

Note that the current values for all parameter fields are returned even though log_verbose_level was the only parameter that was modified.

GRPC

For the logging extension, Triton implements the following API:

service GRPCInferenceService
{
  …

  // Update and get the log setting of the Triton server.
  rpc LogSettings(LogSettingsRequest)
          returns (LogSettingsResponse) {}
}

The Log Setting API returns the latest log settings. Errors are indicated by the google.rpc.Status returned for the request. The OK code indicates success and other codes indicate failure. The request and response messages for Log Settings are:

message LogSettingsRequest
{
  message SettingValue
  {
    oneof parameter_choice
    {
      // bool param option
      bool bool_param = 1;

      // uint32 param option
      uint32 uint32_param = 2;

      // string param option
      string string_param = 3;
    }
  }
  // The new setting values to be updated.
  // Unspecified settings will remain unchanged.
  map<string, SettingValue> settings = 1;
}

message LogSettingsResponse
{
  message SettingValue
  {
    oneof parameter_choice
    {
      // bool param option
      bool bool_param = 1;

      // uint32 param option
      uint32 uint32_param = 2;

      // string param option
      string string_param = 3;
    }
  }
  // The latest log settings values.
  map<string, SettingValue> settings = 1;
}

Logging Formats

The logging extension offers two logging formats. The formats have a common set of fields but differ in how the timestamp for a log entry is represented. Messages are serialized according to JSON encoding rules by default. This behavior can be disabled by setting the environment variable TRITON_SERVER_ESCAPE_LOG_MESSAGES to "0" when launching the server but can not be changed through the logging extension.

Log entries can be single-line or multi-line. Multi-line entries have a single optional heading followed by the structured representation of an object such as a table or protobuf message. Multi-line entries end when the next log entry begins.

TRITONSERVER_LOG_DEFAULT

Single-line Entry

<level><month><day><hour>:<min>:<sec>.<usec> <pid> <file>:<line>] <message>

Example:

I0520 20:03:25.829575 3355 model_lifecycle.cc:441] "AsyncLoad() 'simple'"

Multi-line Entry

<level><month><day><hour>:<min>:<sec>.<usec> <pid> <file>:<line>] <heading>
<object>

Example:

I0520 20:03:25.912303 3355 server.cc:676]
+--------+---------+--------+
| Model  | Version | Status |
+--------+---------+--------+
| simple | 1       | READY  |
+--------+---------+--------+

TRITONSERVER_LOG_ISO8601

Single-line Entry

<year>-<month>-<day>T<hour>:<min>:<sec>Z <level> <pid> <file>:<line>] <message>

Example:

2024-05-20T20:03:26Z I 3415 model_lifecycle.cc:441] "AsyncLoad() 'simple'"

Multi-line Entry

<year>-<month>-<day>T<hour>:<min>:<sec>Z <level> <pid> <file>:<line>] <heading>
<object>

Example:

2024-05-20T20:03:26Z I 3415 server.cc:676]
+--------+---------+--------+
| Model  | Version | Status |
+--------+---------+--------+
| simple | 1       | READY  |
+--------+---------+--------+

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