General Settings

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You can configure the following options in Worker Group Configuration:

Description: Optionally, add or edit a description of the Worker Group’s purpose.

Enable teleporting to Workers: Use this toggle to enable or disable authenticated access to Workers’ UI from the Leader (Stream, Edge).

In Cribl Stream 4.1.2 and later, you can configure the following option in Shutdown Settings:

Drain timeout (sec): Determines how long a Cribl server will wait for writes to complete before the server shuts down on individual Worker Processes. If you notice that Workers are under-ingesting available data upon shutdown or restart, increase the 10–second default. Acceptable range of values: minimum 1 second, maximum 600 seconds (10 minutes).

Worker Processes

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For details about this left tab’s Process count, Minimum process count, and Memory (MB) controls, see Sizing and Scaling.

Process count and Minimum process count are not configurable on Cribl Edge, where each Edge Node is automatically allocated 1 Worker Process.

The following controls are also available on this tab to optimize Worker Processes’ throughput on startup.

Max connections at startup: Maximum number of connections accepted at Worker Process startup. Defaults to 1. Enter a negative integer for unlimited connections.

Startup throttling duration (ms): Maximum time (in milliseconds) to continue throttling connections after Worker Process startup. Defaults to 10000 ms (10 sec.) Enter 0 to disable throttling.

Load throttle %: Sets a threshold to prevent overwhelming Workers. If 90% of a Worker Process’ CPU utilization readings over the preceding 1 minute exceed this threshold, Cribl Stream will reject new connections until the CPU load stabilizes. Defaults to 0% (no throttling). Enter a percentage between 1–100 to enable throttling.

You configure the CPU saturation threshold, but the 90% sampling trigger is not configurable. Also, _raw stats > cpuPerc values might diverge from your Load throttle % threshold. This is because cpuPerc is sampled and averaged once per minute, whereas the Load throttle % is evaluated every second, with a rolling 1-minute lookback sample. (These intervals are also not configurable.)

Single-threaded mode (V8): Limits the JavaScript V8 engine to a single thread. Consult Cribl Support before toggling this off.

Other Settings

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This page’s remaining options work essentially the same way as their Global Settings counterparts. Use the following links for details about: logging levels/redactions, access management security, scripts, and diagnostics.