Feature complete Observability metrics

[asteriscos]

Description

As part of the MVP of the reporting revamp objective, we need to define and implement the use cases of the Observability > Metrics plugin. To achieve this we have to define the data structures, inject documents in the indexer, and display that information using the native features of the Metrics plugin.
This implementation has to be available out of the box in a Wazuh deployment, therefore we have to develop the means to set it up in a Wazuh dashboard initial configuration.

Objective

• Reporting revamp #164

Functional requirements

• Use the Metrics data model to define the structures:
  • https://opentelemetry.io/docs/specs/otel/metrics/data-model/#metric-points
  • https://opentelemetry.io/docs/specs/semconv/general/metrics/
• Use a gauge, histogram, and counter in the metrics dashboard

Tasks

• Define use cases data structure
• Generate sample data using a script
• Create a dashboard in the Metrics plugin
• Analyze the rollover mechanism to diminish granularity over time
• Develop the means to set it up in the initial deployment of Wazuh dashboard