Add sustained throttling auto-suspension for SummaryRules

[jessejlt]

Summary

• add sustained throttling detection that auto-suspends SummaryRule execution and surfaces context in status
• block new submissions, backlog resubmits, and async retries while suspended to protect ADX
• expand tests around the suspension heuristic and document the manual recovery requirements

Testing

• go test ./adxexporter
• go test ./...

[Copilot]

Pull Request Overview

This PR introduces an auto-suspension feature for SummaryRules to protect ADX from sustained throttling. When a SummaryRule experiences throttling errors for an extended period (at least max(3 * spec.interval, 15m)), the ADX Exporter automatically suspends execution and surfaces a condition requiring manual operator intervention to resume.

Key changes:

• Adds suspension detection logic that monitors throttling failures and automatically suspends rules exceeding the threshold
• Updates reconciliation flow to skip submissions, backfill, and retries when a rule is suspended while still tracking inflight operations
• Adds comprehensive test coverage for suspension scenarios including skip logic and threshold calculations

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 7 comments.

File	Description
docs/crds.md	Documents the auto-suspension guardrail feature with details on trigger conditions and operator intervention requirements
adxexporter/summaryrule.go	Implements suspension evaluation, throttle detection, and updates reconciliation flow to respect suspension state
adxexporter/summaryrule_test.go	Adds five new tests covering suspension scenarios: skip submission, idle backlog, inflight tracking, retry skipping, and threshold evaluation

Comments suppressed due to low confidence (1)

adxexporter/summaryrule.go:1

• [nitpick] The logic for handling backlog operations when suspended is split across two conditionals (lines 553-555 and 556-559). This could be simplified by combining into a single conditional: if op.OperationId == \"\" { if !suspended { r.processBacklogOperation(ctx, rule, op) } return }.

package adxexporter