Issues

• Server /metrics endpoint share the same task event as /health: TASK_TYPE_METRICS. It means metrics are reset on both calls.
• the Process-Start-Time-Unix http response header is not set.
• metrics llamacpp:prompt_tokens_seconds and llamacpp:predicted_tokens_seconds are per slots, while the server actually process llamacpp:prompt_tokens_seconds * n_slots

Proposal

• Add a data params in TASK_TYPE_METRICS to reset the metric bucket only in /metrics
• Add llamacpp:prompt_tokens_seconds_total and llamacpp:predicted_tokens_seconds_total