Mastering Incident Troubleshooting: Proven SRE Strategies for Ops Teams

In this piece the author, a frontline SRE practitioner, discusses the topic of problem troubleshooting, drawing on many unusual online incidents and SRE‑recommended methods.

Problem troubleshooting is not mysticism

Finding the root cause of an online issue and fixing it is rewarding; people often ask how the cause was identified, and the answer is usually “experience,” which feels vague and turns troubleshooting into a black art.

Troubleshooting is like detective work

System anomalies are normal; normality is the exception

Modern computer systems are extremely complex, involving DNS, networks, load balancers, servers, containers, databases, caches, and more; any component can fail, especially in distributed environments, so encountering anomalies should be expected.

Pilot’s primary task is to keep the plane flying

In a junior pilot’s training, the primary task during an emergency is to keep the aircraft airborne; locating and fixing the fault is secondary. – SRE

Thus, restoring service is the top priority, not immediately finding the cause.

Clarify the case

Assess the impact scope: is the whole user base affected or only some users or specific business lines? Determine whether the incident is minor or critical.

There is only one truth

Computers operate on binary logic; every symptom has a single root cause, and nothing happens by chance.

Organize clues

Collect all available signals—monitoring alerts, user reports, developer feedback—without discarding seemingly irrelevant information.

Expand information

Ask developers about recent changes, check network team adjustments, and review logs and metrics to broaden the data set.

Analyze testimonies

User reports are reliable, but verbal descriptions can be filtered or misleading; treat each testimony with healthy skepticism.

When you hear hooves, think of a horse, not a zebra

Avoid preconceived notions; sometimes the simplest, seemingly impossible cause is correct (e.g., a saturated network card caused a MySQL connection issue).

From big to small, from top to bottom

Start with high‑level components (ISP, data‑center status) and narrow down; then follow the call chain from the topmost layer downwards.

SRE‑recommended methods

Typical troubleshooting steps: locate, inspect, diagnose, test/fix, and heal.

Ask “what”, “where”, and “why”: what the system is doing, why it does it, and where resources are consumed.

Identify the time of the last modification.

Provide rich diagnostic and monitoring tools.

Next time you face an incident, apply these practices to make troubleshooting less mysterious.