dt-mcp-server: Skill for Claude Code

Application Services Skill

Monitor application service performance, health, and runtime-specific metrics using DQL.

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Core Capabilities

1. Service Performance (RED Metrics)

Monitor service Rate, Errors, Duration using metrics-based timeseries queries.

Key Metrics:

• dt.service.request.response_time - Response time (microseconds)
• dt.service.request.count - Request count
• dt.service.request.failure_count - Failed request count

Common Use Cases:

• Response time monitoring (avg, p50, p95, p99)
• Error rate tracking and spike detection
• Traffic analysis (throughput, peaks, growth)
• Performance degradation detection
• Multi-cluster comparison

Quick Example:

timeseries {
  p95 = percentile(dt.service.request.response_time, 95),
  total_requests = sum(dt.service.request.count),
  failures = sum(dt.service.request.failure_count)
}, by: {dt.service.name}
| fieldsAdd p95_ms = p95[] / 1000, error_rate_pct = (failures[] * 100.0) / total_requests[]

→ For detailed queries: See references/service-metrics.md

2. Advanced Service Analysis

Span-based queries for complex scenarios requiring flexible filtering and custom aggregations.

Use Cases:

• SLA compliance tracking with custom thresholds
• Service health scoring (multi-dimensional)
• Operation/endpoint-level performance analysis
• Custom error classification
• Failure pattern detection with error details

Quick Example:

fetch spans, from: now() - 1h | filter request.is_root_span == true
| fieldsAdd meets_sla = if(request.is_failed == false AND duration < 3s, 1, else: 0)
| summarize total = count(), sla_compliant = sum(meets_sla), by: {dt.service.name}
| fieldsAdd sla_compliance_pct = (sla_compliant * 100.0) / total

→ For detailed queries: See references/service-metrics.md

3. Service Messaging Metrics

Monitor message-based service communication (queues, topics).

Key Metrics:

• dt.service.messaging.publish.count - Messages sent to queues or topics
• dt.service.messaging.receive.count - Messages received from queues or topics
• dt.service.messaging.process.count - Messages successfully processed
• dt.service.messaging.process.failure_count - Messages that failed processing