[`rebased-indexer`]: define reliability requirements based collected metrics and other data

[sergiupopescu199]

Description

The crate collects metrics internally, we need to check on devops side which of those are collected in Grafana and based on that asses some reliability requirements.

• Code Exploration (Metrics): Examine the codebase to identify where the applications collect and expose internal metrics.

• Grafana Access & Dashboard Review: Request access to Grafana and explore the relevant dashboards to see which of those collected metrics are actually visualized and tracked.

• Data Analysis & Requirement Proposal: Based on the displayed metrics and their historical data in Grafana, propose a list of key metrics to track for functional reliability. For each metric, suggest potential thresholds that, if exceeded, could indicate issues and warrant alarms (as an optional alerting functionality).