GCP PubSub

Fetch observability events from GCP’s PubSub messaging system

status: beta role: aggregator delivery: at-least-once acknowledgements: yes egress: stream state: stateless output: log
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Requirements 

The GCP Pub/Sub source requires a Pub/Sub subscription.

Configuration

Example configurations 

{
  "sources": {
    "my_source_id": {
      "type": "gcp_pubsub"
    }
  }
}
[sources.my_source_id]
type = "gcp_pubsub"

---
sources:
  my_source_id:
    type: gcp_pubsub

{
  "sources": {
    "my_source_id": {
      "type": "gcp_pubsub",
      "ack_deadline_secs": 600,
      "endpoint": "https://pubsub.googleapis.com",
      "full_response_size": 100,
      "keepalive_secs": 60,
      "max_concurrency": 10,
      "poll_time_seconds": 2,
      "retry_delay_secs": 1
    }
  }
}
[sources.my_source_id]
type = "gcp_pubsub"
ack_deadline_secs = 600
endpoint = "https://pubsub.googleapis.com"
full_response_size = 100
keepalive_secs = 60
max_concurrency = 10
poll_time_seconds = 2
retry_delay_secs = 1

---
sources:
  my_source_id:
    type: gcp_pubsub
    ack_deadline_secs: 600
    endpoint: https://pubsub.googleapis.com
    full_response_size: 100
    keepalive_secs: 60
    max_concurrency: 10
    poll_time_seconds: 2
    retry_delay_secs: 1

ack_deadline_seconds

optional uint

Deprecated

This option has been deprecated, use ack_deadline_secs instead.

The acknowledgement deadline, in seconds, to use for this stream.

Messages that are not acknowledged when this deadline expires may be retransmitted.

ack_deadline_secs

optional uint

The acknowledgement deadline, in seconds, to use for this stream.

Messages that are not acknowledged when this deadline expires may be retransmitted.

default: 600 (seconds)

acknowledgements

optional object

Deprecated

This field is deprecated.

Controls how acknowledgements are handled by this source.

This setting is deprecated in favor of enabling acknowledgements at the global or sink level.

Enabling or disabling acknowledgements at the source level has no effect on acknowledgement behavior.

See End-to-end Acknowledgements for more information on how event acknowledgement is handled.

acknowledgements.enabled

optional bool
Whether or not end-to-end acknowledgements are enabled for this source.

api_key

optional string literal

An API key.

Either an API key or a path to a service account credentials JSON file can be specified.

If both are unset, the GOOGLE_APPLICATION_CREDENTIALS environment variable is checked for a filename. If no filename is named, an attempt is made to fetch an instance service account for the compute instance the program is running on. If this is not on a GCE instance, then you must define it with an API key or service account credentials JSON file.

credentials_path

optional string literal

Path to a service account credentials JSON file.

Either an API key or a path to a service account credentials JSON file can be specified.

If both are unset, the GOOGLE_APPLICATION_CREDENTIALS environment variable is checked for a filename. If no filename is named, an attempt is made to fetch an instance service account for the compute instance the program is running on. If this is not on a GCE instance, then you must define it with an API key or service account credentials JSON file.

decoding

optional object
Configures how events are decoded from raw bytes.

decoding.codec

optional string literal enum
The codec to use for decoding events.
Enum options
OptionDescription
bytesUses the raw bytes as-is.
gelfDecodes the raw bytes as a GELF message.
jsonDecodes the raw bytes as JSON.
native

Decodes the raw bytes as Vector’s native Protocol Buffers format.

This codec is experimental.

native_json

Decodes the raw bytes as Vector’s native JSON format.

This codec is experimental.

syslog

Decodes the raw bytes as a Syslog message.

Decodes either as the RFC 3164-style format (“old” style) or the RFC 5424-style format (“new” style, includes structured data).

default: bytes

endpoint

optional string literal
The endpoint from which to pull data.
Examples 
"https://us-central1-pubsub.googleapis.com"
default: https://pubsub.googleapis.com

framing

optional object

Framing configuration.

Framing handles how events are separated when encoded in a raw byte form, where each event is a frame that must be prefixed, or delimited, in a way that marks where an event begins and ends within the byte stream.

framing.character_delimited

required object
Options for the character delimited decoder.
Relevant when: method = "character_delimited"
framing.character_delimited.delimiter
required uint
The character that delimits byte sequences.
framing.character_delimited.max_length
optional uint

The maximum length of the byte buffer.

This length does not include the trailing delimiter.

By default, there is no maximum length enforced. If events are malformed, this can lead to additional resource usage as events continue to be buffered in memory, and can potentially lead to memory exhaustion in extreme cases.

If there is a risk of processing malformed data, such as logs with user-controlled input, consider setting the maximum length to a reasonably large value as a safety net. This ensures that processing is not actually unbounded.

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 (for example, 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

framing.newline_delimited

optional object
Options for the newline delimited decoder.
Relevant when: method = "newline_delimited"
framing.newline_delimited.max_length
optional uint

The maximum length of the byte buffer.

This length does not include the trailing delimiter.

By default, there is no maximum length enforced. If events are malformed, this can lead to additional resource usage as events continue to be buffered in memory, and can potentially lead to memory exhaustion in extreme cases.

If there is a risk of processing malformed data, such as logs with user-controlled input, consider setting the maximum length to a reasonably large value as a safety net. This ensures that processing is not actually unbounded.

framing.octet_counting

optional object
Options for the octet counting decoder.
Relevant when: method = "octet_counting"
framing.octet_counting.max_length
optional uint
The maximum length of the byte buffer.

full_response_size

optional uint

The number of messages in a response to mark a stream as “busy”. This is used to determine if more streams should be started.

The GCP Pub/Sub servers send responses with 100 or more messages when the subscription is busy.

default: 100

keepalive_secs

optional float
The amount of time, in seconds, with no received activity before sending a keepalive request. If this is set larger than 60, you may see periodic errors sent from the server.
default: 60 (seconds)

max_concurrency

optional uint
The maximum number of concurrent stream connections to open at once.
default: 10

poll_time_seconds

optional float
How often to poll the currently active streams to see if they are all busy and so open a new stream.
default: 2 (seconds)

project

required string literal
The project name from which to pull logs.

proxy

optional object

Proxy configuration.

Configure to proxy traffic through an HTTP(S) proxy when making external requests.

Similar to common proxy configuration convention, users can set different proxies to use based on the type of traffic being proxied, as well as set specific hosts that should not be proxied.

proxy.enabled

optional bool
Enables proxying support.
default: true

proxy.http

optional string literal

Proxy endpoint to use when proxying HTTP traffic.

Must be a valid URI string.

Examples 
"http://foo.bar:3128"

proxy.https

optional string literal

Proxy endpoint to use when proxying HTTPS traffic.

Must be a valid URI string.

Examples 
"http://foo.bar:3128"

proxy.no_proxy

optional [string]

A list of hosts to avoid proxying.

Multiple patterns are allowed:

PatternExample match
Domain namesexample.com matches requests to example.com
Wildcard domains.example.com matches requests to example.com and its subdomains
IP addresses127.0.0.1 matches requests to 127.0.0.1
CIDR blocks192.168.0.0/16 matches requests to any IP addresses in this range
Splat* matches all hosts

retry_delay_seconds

optional float

Deprecated

This option has been deprecated, use retry_delay_secs instead.
The amount of time, in seconds, to wait between retry attempts after an error.

retry_delay_secs

optional float
The amount of time, in seconds, to wait between retry attempts after an error.
default: 1 (seconds)

subscription

required string literal
The subscription within the project which is configured to receive logs.

tls

optional object
TLS configuration.

tls.alpn_protocols

optional [string]

Sets the list of supported ALPN protocols.

Declare the supported ALPN protocols, which are used during negotiation with peer. They are prioritized in the order that they are defined.

tls.ca_file

optional string literal

Absolute path to an additional CA certificate file.

The certificate must be in the DER or PEM (X.509) format. Additionally, the certificate can be provided as an inline string in PEM format.

Examples 
"/path/to/certificate_authority.crt"

tls.crt_file

optional string literal

Absolute path to a certificate file used to identify this server.

The certificate must be in DER, PEM (X.509), or PKCS#12 format. Additionally, the certificate can be provided as an inline string in PEM format.

If this is set, and is not a PKCS#12 archive, key_file must also be set.

Examples 
"/path/to/host_certificate.crt"

tls.key_file

optional string literal

Absolute path to a private key file used to identify this server.

The key must be in DER or PEM (PKCS#8) format. Additionally, the key can be provided as an inline string in PEM format.

Examples 
"/path/to/host_certificate.key"

tls.key_pass

optional string literal

Passphrase used to unlock the encrypted key file.

This has no effect unless key_file is set.

Examples 
"${KEY_PASS_ENV_VAR}"
"PassWord1"

tls.verify_certificate

optional bool

Enables certificate verification.

If enabled, certificates must not be expired and must be issued by a trusted issuer. This verification operates in a hierarchical manner, checking that the leaf certificate (the certificate presented by the client/server) is not only valid, but that the issuer of that certificate is also valid, and so on until the verification process reaches a root certificate.

Relevant for both incoming and outgoing connections.

Do NOT set this to false unless you understand the risks of not verifying the validity of certificates.

tls.verify_hostname

optional bool

Enables hostname verification.

If enabled, the hostname used to connect to the remote host must be present in the TLS certificate presented by the remote host, either as the Common Name or as an entry in the Subject Alternative Name extension.

Only relevant for outgoing connections.

Do NOT set this to false unless you understand the risks of not verifying the remote hostname.

Environment variables

HTTPS_PROXY

common optional string literal

The global URL to proxy HTTPS requests through.

If another HTTPS proxy is set in the configuration file or at a component level, this one will be overridden.

The lowercase variant has priority over the uppercase one.

Examples
http://foo.bar:3128

HTTP_PROXY

common optional string literal

The global URL to proxy HTTP requests through.

If another HTTP proxy is set in the configuration file or at a component level, this one will be overridden.

The lowercase variant has priority over the uppercase one.

Examples
http://foo.bar:3128

NO_PROXY

common optional string literal

List of hosts to avoid proxying globally.

Allowed patterns here include:

PatternExample match
Domain namesexample.com matches requests to example.com
Wildcard domains.example.come matches requests to example.com and its subdomains
IP addresses127.0.0.1 matches requests to 127.0.0.1
CIDR blocks192.168.0.0./16 matches requests to any IP addresses in this range
Splat* matches all hosts

If another no_proxy value is set in the configuration file or at a component level, this one is overridden.

The lowercase variant has priority over the uppercase one.

Examples
localhost,.example.com,192.168.0.0./16
*

http_proxy

common optional string literal

The global URL to proxy HTTP requests through.

If another HTTP proxy is set in the configuration file or at a component level, this one will be overridden.

The lowercase variant has priority over the uppercase one.

Examples
http://foo.bar:3128

https_proxy

common optional string literal

The global URL to proxy HTTPS requests through.

If another HTTPS proxy is set in the configuration file or at a component level, this one will be overridden.

The lowercase variant has priority over the uppercase one.

Examples
http://foo.bar:3128

no_proxy

common optional string literal

List of hosts to avoid proxying globally.

Allowed patterns here include:

PatternExample match
Domain namesexample.com matches requests to example.com
Wildcard domains.example.come matches requests to example.com and its subdomains
IP addresses127.0.0.1 matches requests to 127.0.0.1
CIDR blocks192.168.0.0./16 matches requests to any IP addresses in this range
Splat* matches all hosts

If another no_proxy value is set in the configuration file or at a component level, this one is overridden.

The lowercase variant has priority over the uppercase one.

Examples
localhost,.example.com,192.168.0.0./16
*

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 Pub/Sub record
Fields
attributes required object
Attributes that were published with the Pub/Sub record.
Examples
{
  "key": "value"
}
message required string literal
The message from the Pub/Sub record, parsed from the raw data.
Examples
53.126.150.246 - - [01/Oct/2020:11:25:58 -0400] "GET /disintermediate HTTP/2.0" 401 20308
message_id required string literal
The ID of this message, assigned by the server when the message is published. Guaranteed to be unique within the topic.
Examples
2345
source_type required string literal
The name of the source type.
Examples
gcp_pubsub
timestamp required timestamp
The time this message was published in the topic.
Examples
2020-10-10T17:07:36.452332Z

Telemetry

Metrics

link

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.

source_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.

How it works

Automatic Concurrency Management 

The `gcp_pubsub` source automatically manages the number of concurrent active streams by
monitoring the traffic flowing over the streams.
When a stream receives full responses (as determined by the `full_response_size` setting),
it marks itself as being "busy".
Periodically, the source will poll all the active connections and will start a new stream
if all the active streams are marked as busy and fewer than `max_concurrency` streams are
active.
Conversely, when a stream passes an idle interval (configured by the
`idle_timeout_seconds` setting) with no traffic and no outstanding acknowledgements,
it will drop the connection unless there are no other streams active.
This combination of actions allows this source to respond dynamically to high load levels
without opening up extra connections at startup.

Context

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

GCP Pub/Sub

The gcp_pubsub source streams messages from GCP Pub/Sub. This is a highly scalable / durable queueing system with at-least-once queuing semantics. Messages are received in a stream and are either acknowledged immediately after receiving or after it has been fully processed by the sink(s), depending on if any of the sink(s) have the acknowledgements setting enabled.

State

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

Transport Layer Security (TLS)

Vector uses OpenSSL for TLS protocols. You can adjust TLS behavior via the tls.* options.
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