An honest map of what your APM can actually see

Overview

A payments processor believed their estate was fully instrumented until an outage in an uncovered component took hours to locate. AceMQ assessed real coverage across services, dependencies, and background work.

Challenge

Coverage looked complete because every deployed service had an agent attached. What the inventory missed was that several critical code paths were invisible anyway: background workers and scheduled jobs produced no transactions because nothing marked their entry points, custom database access layers were not recognized by the auto-instrumentation, and outbound calls through an internal HTTP client wrapper appeared as generic external segments with no target attribution. The map showed coverage; the reality had holes exactly where debugging was hardest.

Environment

Hybrid estate with Java and Node.js services, scheduled batch work, custom data access and HTTP client libraries.

Approach

Rather than counting agents, the assessment checks what telemetry each service actually produces against what it actually does. We compare the deployment inventory to reporting entities, inspect transaction and segment data per service for the expected shapes, and specifically probe the areas auto-instrumentation is known to miss.

Solution

• Deployment inventory reconciled against reporting entities to find services that are deployed but silently not reporting
• Per-service transaction and segment data inspected for expected shapes rather than assuming an attached agent means coverage
• Background workers, scheduled jobs, and consumer loops checked specifically, since these rarely instrument automatically
• Custom data access and HTTP client wrappers identified as instrumentation blind spots with explicit remediation defined
• Alert and dashboard coverage mapped against business-critical paths to find monitored components with no alerting
• Prioritized remediation backlog ordered by blast radius, with effort estimated per item

Outcome

Technologies