[Backend] Build Keeper SLO Metrics for Poll Freshness and Execution Lateness

[ayomideadeniran]

Contributor Focus: [Service Objectives] Measure backend behavior in terms of reliability targets rather than raw counters only
ETA: 2 days

Context

Raw counts are useful, but operators also need service-level indicators for freshness and timeliness.

Problem

Without defined SLO-style metrics, it is harder to reason about whether the backend is meeting product expectations.

Task Breakdown

1. Define backend indicators such as poll freshness, execution lateness, and retry delay.
2. Add instrumentation for those indicators.
3. Expose the metrics in a stable, documented format.
4. Suggest thresholds or targets that are reasonable for current scale.
5. Document known limitations of the measurements.

Acceptance Criteria

• Backend timeliness can be measured directly.
• Metrics are understandable by contributors and operators.
• Suggested thresholds are documented.
• The observability model supports future alerting work.

[Risktaker001]

@Risktaker001 has applied to work on this issue as part of the Stellar Wave Program's 4th wave.

Hello, can this issue be given to me?

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[Gbena-afk]

@Gbena-afk has applied to work on this issue as part of the Stellar Wave Program's 4th wave.

Dear maintainer, pls assign this issue to me

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[drips-wave]

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