Application Performance Monitoring (APM)

Last updated: February 8, 2026Reviewed date: February 8, 2026Reading time: 6 min read
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Application performance monitoring (APM) is the process of using software tools and telemetry data to monitor the performance of business-critical applications. Businesses want to ensure that they maintain expected service levels and that customers receive a positive application experience. They use APM tools to deliver real-time data and insights into the performance of applications. Then, IT teams, DevOps, and site reliability engineers can quickly pinpoint...

Key Takeaways

  • This article explains Why is application performance monitoring important? in simple medical language.
  • This article explains What metrics does application performance monitoring track? in simple medical language.
  • This article explains What are the use cases of application performance monitoring? in simple medical language.
  • This article explains What is the difference between application performance monitoring and observability? in simple medical language.
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Application performance monitoring (APM) is the process of using software tools and telemetry data to monitor the performance of business-critical applications. Businesses want to ensure that they maintain expected service levels and that customers receive a positive application experience. They use APM tools to deliver real-time data and insights into the performance of applications. Then, IT teams, DevOps, and site reliability engineers can quickly pinpoint and troubleshoot application issues.

Why is application performance monitoring important?

Effective application performance monitoring (APM) is integral to an enterprise’s success. It helps ensure your digital services run smoothly, with minimal downtime, and that your customers consistently receive positive experiences.

Application performance monitoring offers businesses several benefits.

Customer satisfaction

APM is an effective tool for pinpointing where issues occur across an application. It also highlights common problems in the digital customer journey. So, you can improve the customer experience by identifying areas that deliver maximum value to your end users. APM is also effective in determining if changes are beneficial. For example, if a business introduces a new customer service bot, APM metrics can measure how many customers had their query solved by using the bot.

Rapid diagnosis

Just a few minutes of downtime can cause financial losses and result in failed customer journeys. APM can rapidly diagnose application performance issues and point IT teams directly to the problem. This rapid diagnosis keeps downtime to a minimum. Technology teams have more time to develop new applications rather than fix existing ones.

Reduced operating costs

IT teams use APM tools to determine how much resource, infrastructure, and computing power is necessary to keep applications performing optimally. This keeps operating costs to a minimum.

Effective product development

Application performance monitoring tools can be part of a product’s development process. You can implement APM in a test or as-live environment and use APM tools to monitor and analyze synthetic traffic, uncover limitations, and identify errors. Development teams can tap into actionable insights before an application goes live and fix bugs that would previously only have become evident after launch.

Business collaboration

You can share metrics and analysis across business units, which leads to improved communication, the breakdown of silos, better-engaged employees, and increased productivity.

What metrics does application performance monitoring track?

Application performance monitoring (APM) tracks common metrics, like the following.

CPU usage

APM solutions can monitor CPU metrics like CPU usage and memory demands. This ensures your application is getting the compute resources it requires to operate adequately.

Response times

Response times are significant for enterprises, as your users expect to be able to access services without delay. APM solutions measure against an acceptable baseline performance for response times and alert you if response times fall below the threshold.

Error rates

APM software monitors applications to record and report error rates. An example of an error would be when a web inquiry times out or a database query fails. APM will deliver alerts when the error rate rises above predefined parameters—for example, when 5% of the last 50 requests have resulted in an error.

Transaction tracing

Transaction tracing in APM gives you an accurate picture of single transactions carried out in an application. Information captured in transaction tracing includes available function calls, external calls, and database calls. It monitors the transaction request from start to finish.

Instances

An APM solution can monitor and report how many server or application instances your applications are running. It can alert you to scale up or down to meet user demand.

Requests

APM software monitors how many user requests your application receives. By monitoring the traffic, the software can send alerts if it spots any anomalies. For example, it can alert you to unexpected increases in requests, large numbers of requests from the same user, or unusually low requests.

Uptime

Uptime is critically important for enterprises providing online services. Many service level agreements (SLAs) only allow a percentage point of downtime across predetermined periods. APM monitors application availability and compares levels to those agreed upon by the service provider and customer.

What are the use cases of application performance monitoring?

We give some use cases of application performance monitoring (APM) below.

Real user monitoring

Real user monitoring, or end-user experience monitoring, is the collection and analysis of user data to build an understanding of an application’s performance levels. By establishing a baseline for acceptable performance, you can accurately predict when an application will experience issues. For example, if the number of customers experiencing problems when trying to check out items is above the threshold, the APM sends an alert to the relevant teams.

You can perform user monitoring in two ways:

  • Synthetic monitoring simulates user behavior to capture problems before application release to production
  • Agentless monitoring analyzes network traffic without the need to install software agents on monitored applications

User-defined transaction profiling

You can use APM solutions to recreate common user interactions with applications. By doing so, you can better understand the conditions under which issues occur with your digital services. IT teams commonly use user-defined transaction profiling to troubleshoot applications and fix common user issues. 

Component monitoring

Component monitoring, or application component deep-dive monitoring, comprehensively tracks the entirety of IT infrastructure. An application’s complete performance is monitored and analyzed. Monitored resources include memory usage, servers, CPU utilization, and network components. 

Infrastructure monitoring

You can use APM tools to collect data from IT infrastructure, such as servers (server monitoring), containers (container monitoring), databases (database monitoring), virtual machines (VM monitoring), and other backend systems. It is done to detect performance problems and find the root cause of application errors.

Analytics 

Effective APM provides data for analytics that enterprises can use to fix or improve their applications. Some APM tools use artificial intelligence and machine learning (AI/ML) algorithms to conduct predictive analysis, diagnose root causes of errors, and link complex application performance problems.

SLA monitoring

Service level agreements (SLAs) are critical to a contract between an IT services provider and a client. They set out the required levels of service that are agreed upon by both parties. APM can monitor the performance metrics in SLA frameworks, which helps providers ensure they are meeting expectations. It also highlights areas where providers are in danger of falling below the standards outlined in the SLA.

What is the difference between application performance monitoring and observability?

Modern applications with complex architecture require more than application performance monitoring (APM) to troubleshoot issues. Observability brings together information from the entirety of an IT stack into a central platform where high-level business intelligence and insights can be acted upon. APM is a subset of observability. While APM gives an aggregate view of metrics, observability uses several other tools, like distributed tracing, to get a comprehensive understanding of application behavior.

How do you choose the right application performance monitoring solution for your organization?

There are many factors to consider before you integrate an application performance monitoring (APM) platform and its suite of tools into your IT environment.

Buy-in

Ensure your teams understand the rationale and personal benefits behind introducing APM. You need to find a solution that fits in with existing systems and processes your team is comfortable with.

Features

There are numerous APM tools available. Ensure that the APM platform you introduce has the right tools for your applications and that it supports your programming language.

Cost requirements

Introducing APM can demand considerable compute resources, especially if you plan on monitoring several applications. Ensure you have the necessary budget for computing resources along with the cost of the APM itself.

Ownership

Consider who will oversee and own your APM. Which teams will be responsible for maintenance and administration?

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1 Symptom 2 Severity 3 Safe guidance
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Start here: Write or select a symptom. The guide will show warning signs, doctor guidance, diagnostic tests to discuss, OTC safety education, and related RX articles.

Important: This tool is educational only. It cannot diagnose, treat, or replace a doctor. OTC information is not a prescription. In an emergency, contact local emergency services or go to the nearest hospital.

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Prepare before seeing a doctor

A simple rural-patient checklist to help you explain symptoms clearly, ask better questions, and avoid unsafe self-treatment.

Safety note: This is not a prescription or diagnosis. For severe symptoms, pregnancy danger signs, children with serious illness, chest pain, breathing difficulty, stroke-like weakness, or major injury, seek urgent care.

Which doctor may help?

Start with a registered doctor or the nearest qualified health center.

What to tell the doctor

  • Write when the problem started and how it changed.
  • Bring old prescriptions, investigation reports, and current medicines.
  • Write allergies, pregnancy status, diabetes, kidney/liver disease, and major past illnesses.
  • Bring one family member if the patient is weak, elderly, confused, or a child.

Questions to ask

  • What is the most likely cause of my symptoms?
  • Which danger signs mean I should go to hospital quickly?
  • Which tests are necessary now, and which can wait?
  • How should I take medicines safely and what side effects should I watch for?
  • When should I come for follow-up?

Tests to discuss

  • Vital signs: temperature, pulse, blood pressure, oxygen saturation
  • Basic physical examination by a clinician
  • CBC, urine test, blood sugar, or imaging only when clinically needed

Avoid these mistakes

  • Do not use antibiotics, steroid tablets/injections, or strong painkillers without proper medical advice.
  • Do not hide pregnancy, kidney disease, ulcer, allergy, or blood thinner use.
  • Do not delay emergency care when danger signs are present.

Medicine safety and first-aid guide

This section is for patient education only. It does not replace a doctor, pharmacist, or emergency care.

Safe first steps

  • Rest, drink safe water, and observe symptoms carefully.
  • Keep a written note of symptoms, duration, temperature, medicines already taken, and allergy history.
  • Seek medical care quickly if symptoms are severe, worsening, or unusual for the patient.

OTC medicine safety

  • For mild pain or fever, ask a registered pharmacist or doctor before using common over-the-counter pain/fever medicines.
  • Do not combine multiple pain medicines without advice, especially if you have kidney disease, liver disease, stomach ulcer, asthma, pregnancy, or take blood thinners.
  • Do not give adult medicines to children unless a qualified clinician advises it.

Avoid these mistakes

  • Do not start antibiotics without a proper medical decision.
  • Do not use steroid tablets or injections casually for quick relief.
  • Do not delay emergency care because of home remedies.

Get urgent help if

  • Severe symptoms, confusion, fainting, breathing difficulty, chest pain, severe dehydration, or sudden weakness need urgent medical care.
Medicine names, dose, and timing must be decided by a qualified clinician or pharmacist after checking age, pregnancy, allergy, other diseases, and current medicines.

For rural patients and family caregivers

Patient health record and symptom diary

Write your symptoms, medicines already taken, test results, and questions before visiting a doctor. This note stays on your device unless you print or copy it.

Doctor to discuss: Doctor / qualified healthcare provider
Tests to discuss with doctor
  • Basic vital signs: temperature, pulse, blood pressure, oxygen level if needed
  • Relevant blood, urine, imaging, or specialist tests only after clinical assessment
Questions to ask
  • What is the most likely cause of my symptoms?
  • Which warning signs mean I should go to emergency care?
  • Which tests are really needed now?
  • Which medicines are safe for my age, pregnancy status, allergy, kidney/liver/stomach condition, and current medicines?

Emergency warning signs such as chest pain, severe breathing difficulty, sudden weakness, confusion, severe dehydration, major injury, or loss of bladder/bowel control need urgent medical care. Do not wait for online information.

Safe pathway to proper treatment

Patient care roadmap

Use this simple roadmap to understand the next safe steps. It is educational and does not replace examination by a doctor.

Go to emergency care if you notice:
  • Severe or rapidly worsening symptoms
  • Breathing difficulty, chest pain, fainting, confusion, severe weakness, major injury, or severe dehydration
Doctor / service to discuss: Qualified healthcare provider; specialist depends on symptoms and examination.
  1. Step 1

    Check danger signs first

    If danger signs are present, seek emergency care and do not wait for online information.

  2. Step 2

    Record the symptom story

    Write when symptoms started, severity, medicines already taken, allergies, pregnancy status, and test results.

  3. Step 3

    Visit a qualified clinician

    A doctor, nurse, or qualified healthcare provider can examine you and decide which tests or treatment are needed.

  4. Step 4

    Do only useful tests

    Do tests after clinical assessment. Avoid unnecessary tests, random antibiotics, or repeated medicines without diagnosis.

  5. Step 5

    Follow up and return early if worse

    If symptoms worsen, new warning signs appear, or treatment is not helping, return for review quickly.

Rural patient practical tips
  • Take a written symptom diary and all previous prescriptions/test reports.
  • Do not hide medicines already taken, even herbal or over-the-counter medicines.
  • Ask which warning signs mean urgent referral to hospital.

This roadmap is for education. A real diagnosis and treatment plan requires history, examination, and clinical judgment.

RX Patient Help

Ask a health question safely

Write your symptom story. A health professional or site editor can review it before any answer is prepared. This box is not for emergency care.

Emergency first: Severe chest pain, breathing trouble, unconsciousness, stroke signs, severe injury, heavy bleeding, or rapidly worsening symptoms need urgent local medical care now.

Frequently Asked Questions

Why is application performance monitoring important?

Effective application performance monitoring (APM) is integral to an enterprise's success. It helps ensure your digital services run smoothly, with minimal downtime, and that your customers consistently receive positive experiences. Application performance monitoring offers businesses several benefits.

Customer satisfaction APM is an effective tool for pinpointing where issues occur across an application. It also highlights common problems in the digital customer journey. So, you can improve the customer experience by identifying areas that deliver maximum value to your end users. APM is also effective in determining if changes are beneficial. For example, if a business introduces a new customer service bot, APM metrics can measure how many customers had their query solved by using the bot. Rapid diagnosis Just a few minutes of downtime can cause financial losses and result in failed customer journeys. APM can rapidly diagnose application performance issues and point IT teams directly to the problem. This rapid diagnosis keeps downtime to a minimum. Technology teams have more time to develop new applications rather than fix existing ones. Reduced operating costs IT teams use APM tools to determine how much resource, infrastructure, and computing power is necessary to keep applications performing optimally. This keeps operating costs to a minimum. Effective product development Application performance monitoring tools can be part of a product's development process. You can implement APM in a test or as-live environment and use APM tools to monitor and analyze synthetic traffic, uncover limitations, and identify errors. Development teams can tap into actionable insights before an application goes live and fix bugs that would previously only have become evident after launch. Business collaboration You can share metrics and analysis across business units, which leads to improved communication, the breakdown of silos, better-engaged employees, and increased productivity.What metrics does application performance monitoring track?

Application performance monitoring (APM) tracks common metrics, like the following.

CPU usage APM solutions can monitor CPU metrics like CPU usage and memory demands. This ensures your application is getting the compute resources it requires to operate adequately. Response times Response times are significant for enterprises, as your users expect to be able to access services without delay. APM solutions measure against an acceptable baseline performance for response times and alert you if response times fall below the threshold. Error rates APM software monitors applications to record and report error rates. An example of an error would be when a web inquiry times out or a database query fails. APM will deliver alerts when the error rate rises above predefined parameters—for example, when 5% of the last 50 requests have resulted in an error. Transaction tracing Transaction tracing in APM gives you an accurate picture of single transactions carried out in an application. Information captured in transaction tracing includes available function calls, external calls, and database calls. It monitors the transaction request from start to finish. Instances An APM solution can monitor and report how many server or application instances your applications are running. It can alert you to scale up or down to meet user demand. Requests APM software monitors how many user requests your application receives. By monitoring the traffic, the software can send alerts if it spots any anomalies. For example, it can alert you to unexpected increases in requests, large numbers of requests from the same user, or unusually low requests. Uptime Uptime is critically important for enterprises providing online services. Many service level agreements (SLAs) only allow a percentage point of downtime across predetermined periods. APM monitors application availability and compares levels to those agreed upon by the service provider and customer.What are the use cases of application performance monitoring?

We give some use cases of application performance monitoring (APM) below.

Real user monitoring Real user monitoring, or end-user experience monitoring, is the collection and analysis of user data to build an understanding of an application's performance levels. By establishing a baseline for acceptable performance, you can accurately predict when an application will experience issues. For example, if the number of customers experiencing problems when trying to check out items is above the threshold, the APM sends an alert to the relevant teams.You can perform user monitoring in two ways:Synthetic monitoring simulates user behavior to capture problems before application release to production Agentless monitoring analyzes network traffic without the need to install software agents on monitored applicationsUser-defined transaction profiling You can use APM solutions to recreate common user interactions with applications. By doing so, you can better understand the conditions under which issues occur with your digital services. IT teams commonly use user-defined transaction profiling to troubleshoot applications and fix common user issues.  Component monitoring Component monitoring, or application component deep-dive monitoring, comprehensively tracks the entirety of IT infrastructure. An application's complete performance is monitored and analyzed. Monitored resources include memory usage, servers, CPU utilization, and network components.  Infrastructure monitoring You can use APM tools to collect data from IT infrastructure, such as servers (server monitoring), containers (container monitoring), databases (database monitoring), virtual machines (VM monitoring), and other backend systems. It is done to detect performance problems and find the root cause of application errors. Analytics  Effective APM provides data for analytics that enterprises can use to fix or improve their applications. Some APM tools use artificial intelligence and machine learning (AI/ML) algorithms to conduct predictive analysis, diagnose root causes of errors, and link complex application performance problems. SLA monitoring Service level agreements (SLAs) are critical to a contract between an IT services provider and a client. They set out the required levels of service that are agreed upon by both parties. APM can monitor the performance metrics in SLA frameworks, which helps providers ensure they are meeting expectations. It also highlights areas where providers are in danger of falling below the standards outlined in the SLA.What is the difference between application performance monitoring and observability?

Modern applications with complex architecture require more than application performance monitoring (APM) to troubleshoot issues. Observability brings together information from the entirety of an IT stack into a central platform where high-level business intelligence and insights can be acted upon. APM is a subset of observability. While APM gives an aggregate view of metrics, observability uses several other tools, like distributed tracing, to get a comprehensive understanding of application behavior.

How do you choose the right application performance monitoring solution for your organization?

There are many factors to consider before you integrate an application performance monitoring (APM) platform and its suite of tools into your IT environment.

References

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