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Version: 3.2

StatsD Extended

Cribl LogStream's StatsD Extended Destination supports sending out data in expanded StatsD format. This is a streaming Destination type.

The output is an expanded StatsD metric protocol that supports dimensions, along with a sample rate for counter metrics. As with StatsD, downstream components listen for application metrics over UDP or TCP, can aggregate and summarize those metrics, and can relay them to virtually any graphing or monitoring backend.

For details about the syntax expected by one common downstream service, see Splunk's Expanded StatsD Metric Protocol documentation.

Configuring LogStream to Output via StatsD Extended

In the QuickConnect UI: Click + Add beside Destinations. From the resulting drawer's tiles, select Metrics > StatsD Extended. Next, click either + Add New or (if displayed) Select Existing. The resulting drawer will provide the following options and fields.

Or, in the Data Routes UI: From the top nav of a LogStream instance or Group, select Data > Destinations. From the resulting page's tiles or the Destinations left nav, select Metrics > StatsD Extended. Next, click + Add New to open a New Destination modal that provides the following options and fields.

General Settings

Output ID: Enter a unique name to identify this StatsD Extended definition.

Destination protocol: Protocol to use when communicating with the Destination. Defaults to UDP.

Host: The hostname of the Destination.

Port: Destination port. Defaults to 8125.

The next two settings apply only to the TCP protocol, and are not displayed for UDP.

Throttling: Rate (in bytes per second) at which at which to throttle while writing to an output. Also takes numerical values in multiples of bytes (KB, MB, GB, etc.). Default value of 0 indicates no throttling.

Backpressure behavior: Select whether to block, drop, or queue events when all receivers are exerting backpressure. (Causes might include a broken or denied connection, or a rate limiter.) Defaults to Block.

Persistent Queue Settings

This section is displayed only for TCP, and only when the Backpressure behavior is set to Persistent Queue.

Max file size: The maximum size to store in each queue file before closing it. Enter a numeral with units of KB, MB, etc. Defaults to 1 MB.

Max queue size: The maximum amount of disk space the queue is allowed to consume. Once this limit is reached, queueing is stopped, and data blocking is applied. Enter a numeral with units of KB, MB, etc.

Queue file path: The location for the persistent queue files. This will be of the form: your/path/here/<worker-id>/<output-id>. Defaults to $CRIBL_HOME/state/queues.

Compression: Codec to use to compress the persisted data, once a file is closed. Defaults to None; Gzip is also available.

Queue fallback behavior: Whether to block or drop events when the queue is exerting backpressure (because disk is low or at full capacity). Block is the same behavior as non-PQ blocking, corresponding to the Block option on the Backpressure behavior drop-down. Drop new data drops the newest events from being sent out of LogStream, and throws away incoming data, while leaving the contents of the PQ unchanged.

Timeout Settings

These timeout settings apply only to the TCP protocol, and are not displayed for UDP.

Connection timeout: Amount of time (in milliseconds) to wait for the connection to establish, before retrying. Defaults to 10000.

Write timeout: Amount of time (milliseconds) to wait for a write to complete, before assuming connection is dead. Defaults to 60000.

Processing Settings


Pipeline: Pipeline to process data before sending the data out using this output.

System fields: A list of fields to automatically add to events that use this output. By default, includes cribl_pipe (identifying the LogStream Pipeline that processed the event). Supports wildcards. Other options include:

  • cribl_host – LogStream Node that processed the event.
  • cribl_wp – LogStream Worker Process that processed the event.
  • cribl_input – LogStream Source that processed the event.
  • cribl_output – LogStream Destination that processed the event.

Advanced Settings

Max record size (bytes): Used when Protocol is UDP. Specifies the maximum size of packets sent to the Destination. (Also known as the MTU – maximum transmission unit – for the network path to the Destination system.) Defaults to 512.

Flush period (sec): Used when Protocol is TCP. Specifies how often buffers should be flushed, sending records to the Destination. Defaults to 1.

Environment: If you're using GitOps, optionally use this field to specify a single Git branch on which to enable this configuration. If empty, the config will be enabled everywhere.