telegraf/plugins/outputs/syslog/README.md

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# Syslog Output Plugin
The syslog output plugin sends syslog messages transmitted over
[UDP](https://tools.ietf.org/html/rfc5426) or
[TCP](https://tools.ietf.org/html/rfc6587) or
[TLS](https://tools.ietf.org/html/rfc5425), with or without the octet counting framing.
Syslog messages are formatted according to
[RFC 5424](https://tools.ietf.org/html/rfc5424).
### Configuration
```toml
[[outputs.syslog]]
## URL to connect to
## ex: address = "tcp://127.0.0.1:8094"
## ex: address = "tcp4://127.0.0.1:8094"
## ex: address = "tcp6://127.0.0.1:8094"
## ex: address = "tcp6://[2001:db8::1]:8094"
## ex: address = "udp://127.0.0.1:8094"
## ex: address = "udp4://127.0.0.1:8094"
## ex: address = "udp6://127.0.0.1:8094"
address = "tcp://127.0.0.1:8094"
## Optional TLS Config
# tls_ca = "/etc/telegraf/ca.pem"
# tls_cert = "/etc/telegraf/cert.pem"
# tls_key = "/etc/telegraf/key.pem"
## Use TLS but skip chain & host verification
# insecure_skip_verify = false
## Period between keep alive probes.
## Only applies to TCP sockets.
## 0 disables keep alive probes.
## Defaults to the OS configuration.
# keep_alive_period = "5m"
## The framing technique with which it is expected that messages are
## transported (default = "octet-counting"). Whether the messages come
## using the octect-counting (RFC5425#section-4.3.1, RFC6587#section-3.4.1),
## or the non-transparent framing technique (RFC6587#section-3.4.2). Must
## be one of "octet-counting", "non-transparent".
# framing = "octet-counting"
## The trailer to be expected in case of non-trasparent framing (default = "LF").
## Must be one of "LF", or "NUL".
# trailer = "LF"
## SD-PARAMs settings
## Syslog messages can contain key/value pairs within zero or more
## structured data sections. For each unrecognised metric tag/field a
## SD-PARAMS is created.
##
## Example:
## [[outputs.syslog]]
## sdparam_separator = "_"
## default_sdid = "default@32473"
## sdids = ["foo@123", "bar@456"]
##
## input => xyzzy,x=y foo@123_value=42,bar@456_value2=84,something_else=1
## output (structured data only) => [foo@123 value=42][bar@456 value2=84][default@32473 something_else=1 x=y]
## SD-PARAMs separator between the sdid and tag/field key (default = "_")
# sdparam_separator = "_"
## Default sdid used for tags/fields that don't contain a prefix defined in
## the explict sdids setting below If no default is specified, no SD-PARAMs
## will be used for unrecognised field.
# default_sdid = "default@32473"
## List of explicit prefixes to extract from tag/field keys and use as the
## SDID, if they match (see above example for more details):
# sdids = ["foo@123", "bar@456"]
## Default severity value. Severity and Facility are used to calculate the
## message PRI value (RFC5424#section-6.2.1). Used when no metric field
## with key "severity_code" is defined. If unset, 5 (notice) is the default
# default_severity_code = 5
## Default facility value. Facility and Severity are used to calculate the
## message PRI value (RFC5424#section-6.2.1). Used when no metric field with
## key "facility_code" is defined. If unset, 1 (user-level) is the default
# default_facility_code = 1
## Default APP-NAME value (RFC5424#section-6.2.5)
## Used when no metric tag with key "appname" is defined.
## If unset, "Telegraf" is the default
# default_appname = "Telegraf"
```
### Metric mapping
The output plugin expects syslog metrics tags and fields to match up with the
ones created in the [syslog input][].
The following table shows the metric tags, field and defaults used to format syslog messages.
| Syslog field | Metric Tag | Metric Field | Default value |
| --- | --- | --- | --- |
| APP-NAME | appname | - | default_appname = "Telegraf" |
| TIMESTAMP | - | timestamp | Metric's own timestamp |
| VERSION | - | version | 1 |
| PRI | - | serverity_code + (8 * facility_code)| default_severity_code=5 (notice), default_facility_code=1 (user-level)|
| HOSTNAME | hostname OR source OR host | - | os.Hostname() |
| MSGID | - | msgid | Metric name |
| PROCID | - | procid | - |
| MSG | - | msg | - |
[syslog input]: /plugins/inputs/syslog#metrics