## Datadog Metrics Tools Usage Guide

When investigating metrics-related issues:

1. **Start with `list_active_datadog_metrics`** to discover available metrics
   - Use filters like `host` or `tag_filter` to narrow results
   - Default shows metrics from last 24 hours

2. **Use `query_datadog_metrics`** to fetch actual metric data
   - Query syntax: `metric_name{tag:value}`
   - Example: `system.cpu.user{host:myhost}`
   - Returns timeseries data with timestamps and values

3. **Use `get_datadog_metric_metadata`** to understand metric properties
   - Provides metric type (gauge/count/rate), unit, and description
   - Accepts comma-separated list for batch queries

### Time Parameters
- Use RFC3339 format: `2023-03-01T10:30:00Z`
- Or relative seconds: `-3600` for 1 hour ago
- Defaults to 1 hour window if not specified

### Common Patterns
- CPU investigation: First list metrics with `tag_filter:kube_node_name:nodename`, then query specific metrics
- Memory issues: Look for `system.mem.*` or `kubernetes.memory.*` metrics
- Container metrics: Filter by pod/container tags
