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Doc how to parse telegraf logs #4285

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Aug 14, 2018
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Doc how to parse telegraf logs #4285

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Doc how to parse telegraf logs
adrianlzt Jun 14, 2018
11f16f1
Syslog could be used to generate a telegraf.log file. Fix regex to us…
adrianlzt Jun 15, 2018
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42 changes: 42 additions & 0 deletions plugins/inputs/logparser/README.md
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Expand Up @@ -213,6 +213,48 @@ A multi-line literal string allows us to encode the pattern:
custom_patterns = 'UNICODE_ESCAPE (?:\\u[0-9A-F]{4})+'
```

#### Parsing Telegraf log file
We can use logparser to convert the log lines generated by Telegraf in metrics.

To do this we need to configure Telegraf to write logs to a file.
This could be done using the ``agent.logfile`` parameter or configuring syslog.
```toml
[agent]
logfile = "/var/log/telegraf/telegraf.log"
```

Logparser configuration:
```toml
[[inputs.logparser]]
files = ["/var/log/telegraf/telegraf.log"]

[inputs.logparser.grok]
measurement = "telegraf_log"
patterns = ['^%{TIMESTAMP_ISO8601:timestamp:ts-rfc3339} %{TELEGRAF_LOG_LEVEL:level:tag}! %{GREEDYDATA:msg}']
custom_patterns = '''
TELEGRAF_LOG_LEVEL (?:[DIWE]+)
'''
```

Example log lines:
```
2018-06-14T06:41:35Z I! Starting Telegraf v1.6.4
2018-06-14T06:41:35Z I! Agent Config: Interval:3s, Quiet:false, Hostname:"archer", Flush Interval:3s
2018-02-20T22:39:20Z E! Error in plugin [inputs.docker]: took longer to collect than collection interval (10s)
2018-06-01T10:34:05Z W! Skipping a scheduled flush because there is already a flush ongoing.
2018-06-14T07:33:33Z D! Output [file] buffer fullness: 0 / 10000 metrics.
```

Generated metrics:
```
telegraf_log,host=somehostname,level=I msg="Starting Telegraf v1.6.4" 1528958495000000000
telegraf_log,host=somehostname,level=I msg="Agent Config: Interval:3s, Quiet:false, Hostname:\"somehostname\", Flush Interval:3s" 1528958495001000000
telegraf_log,host=somehostname,level=E msg="Error in plugin [inputs.docker]: took longer to collect than collection interval (10s)" 1519166360000000000
telegraf_log,host=somehostname,level=W msg="Skipping a scheduled flush because there is already a flush ongoing." 1527849245000000000
telegraf_log,host=somehostname,level=D msg="Output [file] buffer fullness: 0 / 10000 metrics." 1528961613000000000
```


### Tips for creating patterns

Writing complex patterns can be difficult, here is some advice for writing a
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