NATS

Read observability data from subjects on the NATS messaging system

status: beta role: aggregator delivery: best effort acknowledgements: no egress: stream state: stateless output: log
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Configuration

Example configurations 

{
  "sources": {
    "my_source_id": {
      "type": "nats",
      "url": "nats://demo.nats.io",
      "subject": "{{ host }}"
    }
  }
}
[sources.my_source_id]
type = "nats"
url = "nats://demo.nats.io"
subject = "{{ host }}"

---
sources:
  my_source_id:
    type: nats
    url: nats://demo.nats.io
    subject: "{{ host }}"

{
  "sources": {
    "my_source_id": {
      "type": "nats",
      "url": "nats://demo.nats.io",
      "subject": "{{ host }}",
      "connection_name": "vector",
      "queue": "vector",
      "framing": null,
      "auth": null,
      "decoding": null
    }
  }
}
[sources.my_source_id]
type = "nats"
url = "nats://demo.nats.io"
subject = "{{ host }}"
connection_name = "vector"
queue = "vector"

---
sources:
  my_source_id:
    type: nats
    url: nats://demo.nats.io
    subject: "{{ host }}"
    connection_name: vector
    queue: vector
    framing: null
    auth: null
    decoding: null

auth

optional object
Configuration for how Vector should authenticate to NATS.

auth.credentials_file

optional object
Credentials file auth options. Required if auth.strategy=credentials_file.
auth.credentials_file.path
optional string literal
Path to credentials file
Examples 
"/etc/nats/nats.creds"

auth.nkey

optional object
NKey auth options. Required if auth.strategy=nkey.
auth.nkey.nkey
optional string literal
User string representing nkey public key
Examples 
"UDXU4RCSJNZOIQHZNWXHXORDPRTGNJAHAHFRGZNEEJCPQTT2M7NLCNF4"
auth.nkey.seed
optional string literal
Seed string representing nkey private key
Examples 
"SUACSSL3UAHUDXKFSNVUZRF5UHPMWZ6BFDTJ7M6USDXIEDNPPQYYYCU3VY"

auth.strategy

optional string literal enum
The strategy used to authenticate with the NATS server. See https://docs.nats.io/running-a-nats-service/configuration/securing_nats/auth_intro. For TLS Client Certiificate Auth, use the TLS configuration.
Enum options
OptionDescription
credentials_fileCredentials file authentication: https://docs.nats.io/running-a-nats-service/configuration/securing_nats/auth_intro/jwt
nkeyNkey authentication: https://docs.nats.io/running-a-nats-service/configuration/securing_nats/auth_intro/nkey_auth
tokenToken authentication: https://docs.nats.io/running-a-nats-service/configuration/securing_nats/auth_intro/tokens
user_passwordUsername and password authentication: https://docs.nats.io/running-a-nats-service/configuration/securing_nats/auth_intro/username_password
default: user_password

auth.token

optional object
Token auth options. Required if auth.strategy=token.
auth.token.value
optional string literal
token
Examples 
"secret-token"

auth.user_password

optional object
User password auth options. Required if auth.strategy=user_password.
auth.user_password.password
optional string literal
password
Examples 
"nats-password"
auth.user_password.username
optional string literal
username
Examples 
"nats-user"

connection_name

optional string literal
A name assigned to the NATS connection.
Examples 
"foo"
"API Name Option Example"
default: vector

decoding

optional object
Configures in which way frames are decoded into events.

decoding.codec

optional string literal enum
The decoding method.
Enum options
OptionDescription
bytesEvents containing the byte frame as-is.
jsonEvents being parsed from a JSON string.
syslogEvents being parsed from a Syslog message.
default: bytes

framing

optional object
Configures in which way incoming byte sequences are split up into byte frames.

framing.character_delimited

optional object
Options for character_delimited framing.
Relevant when: method = `character_delimited`
framing.character_delimited.delimiter
optional ascii_char
The character used to separate frames.
Examples 
"\n"
"\t"
framing.character_delimited.max_length
optional uint
The maximum frame length limit. Any frames longer than max_length bytes will be discarded entirely.
Examples 
65535
102400

framing.method

optional string literal enum
The framing method.
Enum options
OptionDescription
bytesByte frames are passed through as-is according to the underlying I/O boundaries (e.g. split between messages or stream segments).
character_delimitedByte frames which are delimited by a chosen character.
length_delimitedByte frames whose length is encoded in a header.
newline_delimitedByte frames which are delimited by a newline character.
octet_countingByte frames according to the octet counting format.
default: bytes

framing.newline_delimited

optional object
Options for newline_delimited framing.
Relevant when: method = `newline_delimited`
framing.newline_delimited.max_length
optional uint
The maximum frame length limit. Any frames longer than max_length bytes will be discarded entirely.
Examples 
65535
102400

framing.octet_counting

optional object
Options for octet_counting framing.
Relevant when: method = `octet_counting`
framing.octet_counting.max_length
optional uint
The maximum frame length limit. Any frames longer than max_length bytes will be discarded entirely.
Examples 
65535
102400

queue

optional string literal
NATS Queue Group to join
Examples 
"foo"
"API Name Option Example"
default: vector

subject

required string template
The NATS subject to publish messages to.
Note: This parameter supports Vector's template syntax, which enables you to use dynamic per-event values.
Examples 
"{{ host }}"
"foo"
"time.us.east"
"time.*.east"
"time.\u003e"
"\u003e"

url

required string literal
The NATS URL to connect to. The url must take the form of nats://server:port.
Examples 
"nats://demo.nats.io"
"nats://127.0.0.1:4222"

Outputs

<component_id>

Default output stream of the component. Use this component’s ID as an input to downstream transforms and sinks.

Output Data

Logs

Record

An individual NATS record
Fields
message required string literal
The raw line from the NATS message.
Examples
53.126.150.246 - - [01/Oct/2020:11:25:58 -0400] "GET /disintermediate HTTP/2.0" 401 20308

Telemetry

Metrics

link

component_discarded_events_total

counter
The number of events dropped by this component.
component_id required
The Vector component ID.
component_kind required
The Vector component kind.
component_name required
Deprecated, use component_id instead. The value is the same as component_id.
component_type required
The Vector component type.
host optional
The hostname of the system Vector is running on.
pid optional
The process ID of the Vector instance.

component_errors_total

counter
The total number of errors encountered by this component.
component_id required
The Vector component ID.
component_kind required
The Vector component kind.
component_name required
Deprecated, use component_id instead. The value is the same as component_id.
component_type required
The Vector component type.
error_type required
The type of the error
host optional
The hostname of the system Vector is running on.
pid optional
The process ID of the Vector instance.
stage required
The stage within the component at which the error occurred.

component_received_bytes_total

counter
The number of raw bytes accepted by this component from source origins.
component_id required
The Vector component ID.
component_kind required
The Vector component kind.
component_name required
Deprecated, use component_id instead. The value is the same as component_id.
component_type required
The Vector component type.
container_name optional
The name of the container from which the data originated.
file optional
The file from which the data originated.
host optional
The hostname of the system Vector is running on.
mode optional
The connection mode used by the component.
peer_addr optional
The IP from which the data originated.
peer_path optional
The pathname from which the data originated.
pid optional
The process ID of the Vector instance.
pod_name optional
The name of the pod from which the data originated.
uri optional
The sanitized URI from which the data originated.

component_received_event_bytes_total

counter
The number of event bytes accepted by this component either from tagged origins like file and uri, or cumulatively from other origins.
component_id required
The Vector component ID.
component_kind required
The Vector component kind.
component_name required
Deprecated, use component_id instead. The value is the same as component_id.
component_type required
The Vector component type.
container_name optional
The name of the container from which the data originated.
file optional
The file from which the data originated.
host optional
The hostname of the system Vector is running on.
mode optional
The connection mode used by the component.
peer_addr optional
The IP from which the data originated.
peer_path optional
The pathname from which the data originated.
pid optional
The process ID of the Vector instance.
pod_name optional
The name of the pod from which the data originated.
uri optional
The sanitized URI from which the data originated.

component_received_events_total

counter
The number of events accepted by this component either from tagged origins like file and uri, or cumulatively from other origins.
component_id required
The Vector component ID.
component_kind required
The Vector component kind.
component_name required
Deprecated, use component_id instead. The value is the same as component_id.
component_type required
The Vector component type.
container_name optional
The name of the container from which the data originated.
file optional
The file from which the data originated.
host optional
The hostname of the system Vector is running on.
mode optional
The connection mode used by the component.
peer_addr optional
The IP from which the data originated.
peer_path optional
The pathname from which the data originated.
pid optional
The process ID of the Vector instance.
pod_name optional
The name of the pod from which the data originated.
uri optional
The sanitized URI from which the data originated.

component_sent_event_bytes_total

counter
The total number of event bytes emitted by this component.
component_id required
The Vector component ID.
component_kind required
The Vector component kind.
component_name required
Deprecated, use component_id instead. The value is the same as component_id.
component_type required
The Vector component type.
host optional
The hostname of the system Vector is running on.
output optional
The specific output of the component.
pid optional
The process ID of the Vector instance.

component_sent_events_total

counter
The total number of events emitted by this component.
component_id required
The Vector component ID.
component_kind required
The Vector component kind.
component_name required
Deprecated, use component_id instead. The value is the same as component_id.
component_type required
The Vector component type.
host optional
The hostname of the system Vector is running on.
output optional
The specific output of the component.
pid optional
The process ID of the Vector instance.

events_in_total

counter
The number of events accepted by this component either from tagged origins like file and uri, or cumulatively from other origins. This metric is deprecated and will be removed in a future version. Use component_received_events_total instead.
component_id required
The Vector component ID.
component_kind required
The Vector component kind.
component_name required
Deprecated, use component_id instead. The value is the same as component_id.
component_type required
The Vector component type.
container_name optional
The name of the container from which the data originated.
file optional
The file from which the data originated.
host optional
The hostname of the system Vector is running on.
mode optional
The connection mode used by the component.
peer_addr optional
The IP from which the data originated.
peer_path optional
The pathname from which the data originated.
pid optional
The process ID of the Vector instance.
pod_name optional
The name of the pod from which the data originated.
uri optional
The sanitized URI from which the data originated.

events_out_total

counter
The total number of events emitted by this component. This metric is deprecated and will be removed in a future version. Use component_sent_events_total instead.
component_id required
The Vector component ID.
component_kind required
The Vector component kind.
component_name required
Deprecated, use component_id instead. The value is the same as component_id.
component_type required
The Vector component type.
host optional
The hostname of the system Vector is running on.
output optional
The specific output of the component.
pid optional
The process ID of the Vector instance.

processed_bytes_total

counter
The number of bytes processed by the component.
component_id required
The Vector component ID.
component_kind required
The Vector component kind.
component_name required
Deprecated, use component_id instead. The value is the same as component_id.
component_type required
The Vector component type.
container_name optional
The name of the container from which the bytes originate.
file optional
The file from which the bytes originate.
host optional
The hostname of the system Vector is running on.
mode optional
The connection mode used by the component.
peer_addr optional
The IP from which the bytes originate.
peer_path optional
The pathname from which the bytes originate.
pid optional
The process ID of the Vector instance.
pod_name optional
The name of the pod from which the bytes originate.
uri optional
The sanitized URI from which the bytes originate.

processed_events_total

counter
The total number of events processed by this component. This metric is deprecated in place of using component_received_events_total and component_sent_events_total metrics.
component_id required
The Vector component ID.
component_kind required
The Vector component kind.
component_name required
Deprecated, use component_id instead. The value is the same as component_id.
component_type required
The Vector component type.
host optional
The hostname of the system Vector is running on.
pid optional
The process ID of the Vector instance.

How it works

Context

By default, the nats source augments events with helpful context keys.

nats.rs

The nats source/sink uses nats.rs under the hood.

State

This component is stateless, meaning its behavior is consistent across each input.
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