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@lewislabs lewislabs released this 24 Apr 18:54
· 22 commits to master since this release
3.2.0
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Learn about vigilant mode.

This adds the ability to put Bulkheads into a metrics only mode, through configuration at a per bulkhead, with MjolnirConfiguration.BulkheadConfigurations[<bulkhead-key>].MetricsOnly = true, or at global level using MjolnirConfiguration.BulkheadMetricsOnly = true

Bulkhead concurrency is set at 10 by default in Mjolnir, but this really is an arbitrary number and if bulkhead concurrency isn't properly tuned in a production scenario then it's possible to get a lot of BulkheadRejectionExceptions that actually would have been safe to execute without the need to throttle.

The changes in v3.2.0 add the ability to quickly turn off bulkhead rejections during a production scenario like this.

We felt like it was still important to get metrics for rejections during a time when they're effectively not rejecting, as this may help with tuning the concurrency levels in the future - hence "MetricsOnly".

This version also adds a new IMetricEvent implementation, with the GaugeLogMetrics class to help with some of the diagnostic actions mentioned above.

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