Refactoring ZeroToOneTargetScaler

[alrod]

• Exclude containers that are not intended for monitoring.
• If a container is detected during the initial write log, further scanning is unnecessary.
• Cache recently found write entry to avoid analyzing log blobs again
• Migrate ScaleMonitor to TargetScaler

All of these optimizations are designed to enhance performance during blob trigger scaling from 0 to 1 and to address potential high memory usage issues.

[Copilot]

Pull Request Overview

Refactors blob trigger scaling infrastructure by migrating from ScaleMonitor to TargetScaler and introducing optimizations for zero-to-one scaling decisions based on recent blob writes.

• Replaces IScaleMonitorProvider with ITargetScalerProvider and introduces BlobTargetScalerProvider with caching of recent write detection.
• Adds targeted method GetFirstWriteForContainerAsync to efficiently locate the first relevant write entry and factors parsing logic into a reusable ParseLine method.
• Adds new tests validating caching behavior and recent write detection logic.

Reviewed Changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
StorageBlobsWebJobsBuilderExtensions.cs	Swaps service registration from IScaleMonitorProvider to ITargetScalerProvider to enable new scaling approach.
BlobTargetScalerProvider.cs	Introduces TargetScaler implementation with cached recent write logic.
BlobLogListener.cs	Adds efficient container-scoped write detection and line-level parsing integration.
StorageAnalyticsLogParser.cs	Refactors inline parsing logic into reusable ParseLine method.
ZeroToOneTargetScalerTests.cs	Adds unit tests validating scaling behavior and cache hit logging.
BlobScalerMonitorProvider.cs	Removes deprecated ScaleMonitor-based implementation.

Comments suppressed due to low confidence (1)

sdk/storage/Microsoft.Azure.WebJobs.Extensions.Storage.Blobs/src/Listeners/BlobTargetScalerProvider.cs:1

• These using directives appear unused; removing them will reduce clutter.

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