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Slow Applications Are Criminal | @DevOpsSummit #APM #IoT #DevOps #Docker #Microservices

The Witness, The Watchman, and The Agent

In the world of Application Performance Management (APM) it is always better to enlist more than one entity to help solve the mystery of performance problems.

It's kind of like arriving at the scene of the crime on foreign soil, being blindfolded, shoved out the door, and then asked to help solve the injustice without any insight.  All you can do is begin by asking people in the vicinity, providing you speak their language, for information on what they have seen (i.e. end-user-experience).

Gathering facts related to a crime is essential, and can be likened to utilizing an APM solution for solving application performance problems. The more information about an application's behavior that you can obtain, along with understanding its idiosyncrasies within the environment, the more likely you will be able to pinpoint root causes of performance issues.

The Three People You Need
Wouldn't it be helpful if there was an eye-witness you could interview, a watchman who was on duty during the time of the incident, and an agent you could hire to translate the native tongue and provide insight into the culture?

In much the same way a smart APM strategy enlists the help from these three entities: the Witness, the Watchman, and the Agent.  You start by listening to the testimony from the eye-witness (aka. wire data), collecting the observations from the watchman (aka web robots), and analyzing details from the agent (aka code level instrumentation).

The Witness -
[Passive monitoring - wire-data analytics]

The Witness reports what they see within their field of vision, (aka. passive monitoring, wire-data analytics).  The Witness is watching everything in their purview and sees things as they happen, which corresponds to what is coming across "the wire," in front of them.

The Witness will tell you how many people were involved, if anyone was injured, and what time the event occurred, (e.g. user names, packet loss, timelines, etc.).  She can tell you what doors the people went through, how wide the aisles were, and how fast people were traveling, (e.g., network port listeners, realized bandwidth, round-trip-time, etc.).

The Watchman -
[Active monitoring - synthetic transactions]

The Watchman (aka. web robot) is actively checking and is always on patrol, methodically taking the same path every time.  He will tell you what doors are locked and monitor the ones that are open, collecting measurements along the way on how long it takes to complete his rounds, (i.e. synthetic transactions).

The Watchman will report the status of the rooms and buildings on his patrol and will note if anything happens to him along the way, (e.g. application availability, transaction errors, timeouts, etc.).

The Agent -
[Application code instrumentation]

The Agent you hire is critical for solving the crime within the territory you're operating in.  The Agent will watch activity from specific vantage points throughout the environment and report back his findings.  It's crucial he speaks the local language, (e.g. Java, .Net, PHP) and can easily translate for you.

His approach will be to deploy probes on rooftops and inside the buildings for monitoring all conversations and actions in the environment, (aka. application code instrumentation). He will also tap the communication systems, (i.e. script injection) when appropriate and capture specific measurements from each conversation and record them.

Going from Red to Green
Identifying an application that has gone catatonic is one thing, but assessing the insidious slow performance of a complex multi-tiered application and fixing it, can be very time consuming and costly. Enlisting all three entities described above to assist is a thoughtful strategy for any IT Leader to consider.

To read the full article on the Pulse click here: Slow Application Are Criminal

More Stories By Larry Dragich

Larry Dragich is actively involved with industry leaders, sharing knowledge of Application Performance Management (APM) technologies, from best practices and technical workflows, to resource allocation and approaches for implementation. He has been working in the APM space since 2006 where he built the Enterprise Systems Management team which is now the focal point for IT performance monitoring and capacity planning activities.

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