Datadog Metrics Sink

The Vector datadog_metrics sink batches metric events to Datadog's metrics service using HTTP API.

Configuration

vector.toml
[sinks.my_sink_id]
type = "datadog_metrics" # required
inputs = ["my-source-id"] # required
api_key = "${DATADOG_API_KEY}" # required
healthcheck = true # optional, default
namespace = "service" # required
  • tableoptional

    batch

    Configures the sink batching behavior.

    • int (events)commonoptional

      max_events

      The maximum size of a batch, in events, before it is flushed.

      • Default: 20 (events)
      • View examples
    • int (seconds)commonoptional

      timeout_secs

      The maximum age of a batch before it is flushed.

      • Default: 1 (seconds)
      • View examples
  • stringcommonrequired

    api_key

    Datadog API key

    • No default
    • View examples
  • boolcommonoptional

    healthcheck

    Enables/disables the sink healthcheck upon start.

    See Health Checks for more info.

    • Default: true
    • View examples
  • stringoptional

    host

    Datadog endpoint to send metrics to.

    • Default: "https://api.datadoghq.com"
    • View examples
  • stringcommonrequired

    namespace

    A prefix that will be added to all metric names.

    • No default
    • View examples
  • tableoptional

    request

    Configures the sink request behavior.

    • int (requests)commonoptional

      in_flight_limit

      The maximum number of in-flight requests allowed at any given time.

      See Rate Limits for more info.

      • Default: 5 (requests)
      • View examples
    • int (seconds)commonoptional

      rate_limit_duration_secs

      The time window, in seconds, used for the rate_limit_num option.

      See Rate Limits for more info.

      • Default: 1 (seconds)
      • View examples
    • intcommonoptional

      rate_limit_num

      The maximum number of requests allowed within the rate_limit_duration_secs time window.

      See Rate Limits for more info.

      • Default: 5
      • View examples
    • intoptional

      retry_attempts

      The maximum number of retries to make for failed requests.

      See Retry Policy for more info.

      • Default: -1
      • View examples
    • int (seconds)optional

      retry_initial_backoff_secs

      The amount of time to wait before attempting the first retry for a failed request. Once, the first retry has failed the fibonacci sequence will be used to select future backoffs.

      • Default: 1 (seconds)
      • View examples
    • int (seconds)optional

      retry_max_duration_secs

      The maximum amount of time, in seconds, to wait between retries.

      • Default: 10 (seconds)
      • View examples
    • int (seconds)commonoptional

      timeout_secs

      The maximum time a request can take before being aborted. It is highly recommended that you do not lower value below the service's internal timeout, as this could create orphaned requests, pile on retries, and result in duplicate data downstream.

      • Default: 60 (seconds)
      • View examples

How It Works

Environment Variables

Environment variables are supported through all of Vector's configuration. Simply add ${MY_ENV_VAR} in your Vector configuration file and the variable will be replaced before being evaluated.

You can learn more in the Environment Variables section.

Health Checks

Health checks ensure that the downstream service is accessible and ready to accept data. This check is performed upon sink initialization. If the health check fails an error will be logged and Vector will proceed to start.

Require Health Checks

If you'd like to exit immediately upon a health check failure, you can pass the --require-healthy flag:

vector --config /etc/vector/vector.toml --require-healthy

Disable Health Checks

If you'd like to disable health checks for this sink you can set the healthcheck option to false.

Metric Types

Datadog accepts the following types for submission via API:

  • Count
  • Gauge
  • Rate

The following matrix outlines how Vector metric types are mapped into Datadog metrics types.

Vector MetricsDatadog Metrics
CounterCount
GaugeGauge
Gauge DeltaN/A
HistogramCount [1]
SetN/A
  1. Aggregation of Histogram values is not supported at the moment. Histogram values will be sent as is, as raw Count values.

Rate Limits

Vector offers a few levers to control the rate and volume of requests to the downstream service. Start with the rate_limit_duration_secs and rate_limit_num options to ensure Vector does not exceed the specified number of requests in the specified window. You can further control the pace at which this window is saturated with the in_flight_limit option, which will guarantee no more than the specified number of requests are in-flight at any given time.

Please note, Vector's defaults are carefully chosen and it should be rare that you need to adjust these. If you found a good reason to do so please share it with the Vector team by opening an issue.

Retry Policy

Vector will retry failed requests (status == 429, >= 500, and != 501). Other responses will not be retried. You can control the number of retry attempts and backoff rate with the retry_attempts and retry_backoff_secs options.