> ## Documentation Index
> Fetch the complete documentation index at: https://docs.useharmonia.xyz/llms.txt
> Use this file to discover all available pages before exploring further.

# Logging and monitoring platform

> Correlation, traces, structured logs, metrics, and usage budgets across Harmonia.

## How Harmonia uses it

OpenTelemetry-compatible identifiers correlate web and worker operations. Structured JSON logs support diagnosis, Cloud Trace is the managed trace target, metrics summarize health and throughput, and durable usage records enforce model-budget policy.

<CardGroup cols={2}>
  <Card title="OpenTelemetry" href="/platform/observability/opentelemetry">Propagation and correlation.</Card>
  <Card title="Structured logging" href="/platform/observability/structured-logging">Machine-readable operational events.</Card>
  <Card title="Monitoring metrics" href="/platform/observability/monitoring-metrics">Health and workflow measures.</Card>
  <Card title="Usage and budgets" href="/platform/observability/usage-budget">Pricing, reservation, and reconciliation.</Card>
</CardGroup>

## Evidence status

Local tests prove identifier and record shape. Managed trace ingestion, alerting, and dashboards need authenticated cloud evidence; logs are diagnostic records, not workflow authority.