User Story:
As a PSAP engineer, I want to generate Key Performance Indicators (KPI) metrics from the LTS payload, so that these KPI can be easily processed by Grafana and other dashboarding tools.

A KPI is a simple, named, scalar value, along with key/value metadata and a timestamp

Example:

POST /metrics/rhoai_latency_absolute_ms
{
"ocp_version": "4.13",
"rhods_version": "4.13",
"test": "notebook_gating_test:performance_test",
"label": "2024:02",
"model": "Llama-2b",
"value": 150,
"@timestamp": "2024-01-15T12:00:00Z"
}