Format Log Lines with Custom Line Templates

You can use custom line templates to format the lines in the log viewer to make it easier for you to identify specific information that is of interest to you.

Select an existing View or Create and Edit Views.
Select Edit View Properties.
In the Custom %LINE Template area, enter your template.

Display PID, Program, and Log Source

If you have log lines that look similar to the example, you can decide to display the information in a more easily parsed format.

Enter PID: {{pid}} | Program: {{program}} | Log Source: {{logsource}} into Custom %LINE Template area.
You logs should now look like:

Aug 8 11:29:03 samir-Debian-10 daemon.log PID: 468 | Program: logdna-agent | Log Source: ip-12-34-5-67

Use Reserved Fields

Reserved fields are marked by an underscore. If your data resembles:

user 1234 requested endpoint /api/endpoint

And contains this field metadata:

{
	meta: {
		first_name: Jane,
		last_name: Doe
	}
}

Enter {{_meta.first_name}} {{_meta.last_name}}, aka $@ into Custom %LINE Template area. Using $@ will reference the original line. This will display log messages in that view in this format:

Jane Doe, aka user 1234 requested endpoint /api/endpoint

Return as JSON

You can format your data to return as JSON.

{"index": {{query.index}}, "size": {{query.size}}, "ignore_unavailable": {{query.ignore_unavailable}}, "track_total_hits": {{query.track_total_hits}}, "body": {"query": {{query.body.query}}, "sort": {{query.body.sort}}, "aggs":{{query.body.aggs}}}}

Formatted Log Line Example

Aug 8 12:49:20  xxxx-xxxx-xxxxxxxxx-xxxx  apiinternal info  {"index": ["*:logline.*"], "size": 0, "ignore_unavailable": true, "track_total_hits": true, "body": {"query": {
  "bool": {
    "must": [
      {
        "range": {
          "_ts": {
            "gte": 1659976890001,
            "lte": 1659977360647
          }
        }
      },
      {
        "bool": {
          "should": [
            {
              "term": {
                "_app": "localhost"
              }
            }
          ]
        }
      }
    ]
  }
}, "sort": {
  "_lid": {
    "order": "desc"
  }
}, "aggs":{
  "metrics": {
    "date_histogram": {
      "field": "_ts",
      "interval": "30s"
    }
  }
}}}

Terraform Provider for Mezmo

Search Log Contents

Overview

Ingest Logs

Manage Log Lines

View and Analyze Logs

Alerts

Account and Organization Management

Mezmo MCP and AI

Integrations

Other Topics

Format Log Lines with Custom Line Templates

Display PID, Program, and Log Source

Use Reserved Fields

Return as JSON

Formatted Log Line Example

​Display PID, Program, and Log Source

​Use Reserved Fields

​Return as JSON

​Formatted Log Line Example

Display PID, Program, and Log Source

Use Reserved Fields

Return as JSON

Formatted Log Line Example