Demo Logs

Generate fake log events, which can be useful for testing and demos

status: stable role: daemon role: sidecar delivery: at-least-once acknowledgements: no egress: stream state: stateless output: log previously known as: generator
Generates fakes events useful for testing and demoing.

Alias

This component was previously called the generator source. Make sure to update your Vector configuration to accommodate the name change:

[sources.my_demo_logs_source]
+type = "demo_logs"
-type = "generator"

Configuration

Example configurations

{
  "sources": {
    "my_source_id": {
      "type": "demo_logs",
      "format": "shuffle"
    }
  }
}
[sources.my_source_id]
type = "demo_logs"
format = "shuffle"
---
sources:
  my_source_id:
    type: demo_logs
    format: shuffle
{
  "sources": {
    "my_source_id": {
      "type": "demo_logs",
      "format": "shuffle",
      "interval": 1,
      "count": null,
      "lines": [
        "Line 1"
      ],
      "framing": null,
      "sequence": null,
      "decoding": null
    }
  }
}
[sources.my_source_id]
type = "demo_logs"
format = "shuffle"
interval = 1
lines = [ "Line 1" ]
---
sources:
  my_source_id:
    type: demo_logs
    format: shuffle
    interval: 1
    count: null
    lines:
      - Line 1
    framing: null
    sequence: null
    decoding: null

count

optional uint
The total number of lines to output. By default the source continuously prints logs (infinitely).

decoding

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

decoding.codec

common optional string literal enum
The decoding method.
Enum options
OptionDescription
bytesEvents containing the byte frame as-is.
gelfEvents being parsed from a GELF message.
jsonEvents being parsed from a JSON string.
nativeEvents being parsed from Vector’s native protobuf format (EXPERIMENTAL).
native_jsonEvents being parsed from Vector’s native JSON format (EXPERIMENTAL).
syslogEvents being parsed from a Syslog message.
default: bytes

format

required string literal enum
The format of the randomly generated output.
Examples
"shuffle"
"apache_common"
"apache_error"
"syslog"
"bsd_syslog"
"json"
Enum options string literal
OptionDescription
apache_commonRandomly generated logs in Apache common format.
apache_errorRandomly generated logs in Apache error format.
bsd_syslogRandomly generated logs in Syslog format (RFC 3164).
jsonRandomly generated HTTP server logs in JSON format.
shuffleLines are chosen at random from the list specified using lines.
syslogRandomly generated logs in Syslog format (RFC 5424).

framing

optional object
Configures in which way incoming byte sequences are split up into byte frames.
Options for character_delimited framing.
Relevant when: method = `character_delimited`
The character used to separate frames.
Examples
"\n"
"\t"
The maximum frame length limit. Any frames longer than max_length bytes will be discarded entirely.
Examples
65535
102400

framing.method

common 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 which are prefixed by an unsigned big-endian 32-bit integer indicating the length.
newline_delimitedByte frames which are delimited by a newline character.
octet_countingByte frames according to the octet counting format.
default: bytes
Options for newline_delimited framing.
Relevant when: method = `newline_delimited`
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`
The maximum frame length limit. Any frames longer than max_length bytes will be discarded entirely.
Examples
65535
102400

interval

optional float
The amount of time, in seconds, to pause between each batch of output lines. The default is one batch per second. In order to remove the delay and output batches as quickly as possible, set interval to 0.0.
Examples
1
0.1
0.01
default: 1

lines

optional [string]
The list of lines to output.
Array string literal
Examples
[
  "Line 1",
  "Line 2"
]
Relevant when: `format` = `shuffle`

sequence

optional bool
If true, each output line starts with an increasing sequence number, beginning with 0.
default: false
Relevant when: `format` = `shuffle`

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

Line

An individual event from a batch of events generated by vector for testing purposes.
Fields
source_type required string literal
The name of the source type.
Examples
demo_logs

Telemetry

Metrics

link

component_discarded_events_total

counter
The number of events dropped by this component.
component_id
The Vector component ID.
component_kind
The Vector component kind.
component_name
Deprecated, use component_id instead. The value is the same as component_id.
component_type
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
The Vector component ID.
component_kind
The Vector component kind.
component_name
Deprecated, use component_id instead. The value is the same as component_id.
component_type
The Vector component type.
error_type
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
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
The Vector component ID.
component_kind
The Vector component kind.
component_name
Deprecated, use component_id instead. The value is the same as component_id.
component_type
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
The Vector component ID.
component_kind
The Vector component kind.
component_name
Deprecated, use component_id instead. The value is the same as component_id.
component_type
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
The Vector component ID.
component_kind
The Vector component kind.
component_name
Deprecated, use component_id instead. The value is the same as component_id.
component_type
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
The Vector component ID.
component_kind
The Vector component kind.
component_name
Deprecated, use component_id instead. The value is the same as component_id.
component_type
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
The Vector component ID.
component_kind
The Vector component kind.
component_name
Deprecated, use component_id instead. The value is the same as component_id.
component_type
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_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
The Vector component ID.
component_kind
The Vector component kind.
component_name
Deprecated, use component_id instead. The value is the same as component_id.
component_type
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.

lag_time_seconds

histogram
The difference between the timestamp recorded in each event and the time when it was ingested, expressed as fractional seconds.
component_id
The Vector component ID.
component_kind
The Vector component kind.
component_name
Deprecated, use component_id instead. The value is the same as component_id.
component_type
The Vector component type.
host optional
The hostname of the system Vector is running on.
pid optional
The process ID of the Vector instance.

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
The Vector component ID.
component_kind
The Vector component kind.
component_name
Deprecated, use component_id instead. The value is the same as component_id.
component_type
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 demo_logs source augments events with helpful context keys.

State

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