Register ITargetScalerErrorRepository in AddCommonScaleServices and make public#3204
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…ake public ScaleManager now requires ITargetScalerErrorRepository (added in 3.0.46), but the registration was only added in AddWebJobs(). Callers using ConfigureWebJobsScale (e.g. Scale Controller) go through AddWebJobsScale -> AddCommonScaleServices, which was missing this registration, causing: Unable to resolve service for type 'ITargetScalerErrorRepository' while attempting to activate 'ScaleManager' Changes: - Add TryAddSingleton<ITargetScalerErrorRepository, NullTargetScalerErrorRepository> to AddCommonScaleServices so all scale host scenarios work. - Make ITargetScalerErrorRepository and NullTargetScalerErrorRepository public so external consumers (Scale Controller) can implement the interface directly without reflection-based DispatchProxy workarounds. Co-authored-by: Dobby <dobby@microsoft.com>
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mathewc
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May 18, 2026
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Summary
Fix missing DI registration in AddCommonScaleServices and make ITargetScalerErrorRepository public so external consumers can implement it directly.
Problem
SDK 3.0.46 (PR #3191) introduced ITargetScalerErrorRepository as a required dependency of ScaleManager. However, the TryAddSingleton registration was only added in AddWebJobs(). Callers using ConfigureWebJobsScale (e.g. Scale Controller) go through AddWebJobsScale -> AddCommonScaleServices, which was missing this registration, causing:
Making the interface public allows Scale Controller to provide its own in-memory implementation that tracks errored target scalers within the process lifetime, so broken scalers fall back to incremental monitoring without retrying every cycle.
Changes
Testing