Adding content to 117-monitoring

src/roadmaps/system-design/content/117-monitoring/100-health-monitoring.md

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-# Health monitoring
+# Health Monitoring
+
+A health monitoring system is a system that is designed to collect, store, and analyze health-related data from a variety of sources, such as wearable devices, medical devices, and electronic health records. The goal of a health monitoring system is to provide healthcare professionals and individuals with real-time insights into their health, allowing them to make informed decisions about their care.
+
+Learn more from the following:
+
+- [Design of Wearable Health Monitoring Systems](https://link.springer.com/chapter/10.1007/978-3-319-23341-3_6)

src/roadmaps/system-design/content/117-monitoring/101-availability-monitoring.md

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-# Availability monitoring
+# Availability Monitoring
+
+Availability monitoring in system design refers to the practice of monitoring the availability of a system, service or application, to ensure that it is functioning correctly and is accessible to users when they need it. This is an important aspect of ensuring that a system is reliable and performs well.
+
+Availability monitoring typically includes the following components:
+
+- Heartbeat monitoring
+- Transaction monitoring
+- Alerts and notifications
+- Root cause analysis
+
+Learn more from the following:
+
+- [System Monitoring, Alerting and Availability](https://www.aits.uillinois.edu/services/network_and_desktop_services/system_monitoring__alerting_and_availability)

src/roadmaps/system-design/content/117-monitoring/102-performance-monitoring.md

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-# Performance monitoring
+# Performance Monitoring
+
+Performance monitoring in system design refers to the practice of monitoring the performance of a system, service, or application, in order to ensure that it is performing well and meeting the needs of users. This is an important aspect of ensuring that a system is reliable and performs well.
+
+Learn more from following links:
+
+- [Get More on Performance Monitoring Systems](https://www.solarwinds.com/server-application-monitor/use-cases/performance-monitoring-system)

src/roadmaps/system-design/content/117-monitoring/103-security-monitoring.md

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-# Security monitoring
+# Security Monitoring
+
+Security monitoring in system design refers to the practice of monitoring the security of a system, service, or application, in order to detect and respond to security threats and vulnerabilities. This is an important aspect of ensuring that a system is secure and protected against unauthorized access, data breaches, and other security incidents.
+
+Security monitoring typically includes the following components:
+
+- Event collection
+- Event analysis and correlation
+- Alerts and notifications
+- Incident response
+- Compliance and audit
+
+Visit the following to learn more:
+
+- [Intro to Security Monitoring](https://www.sciencedirect.com/topics/computer-science/security-monitoring)

src/roadmaps/system-design/content/117-monitoring/104-usage-monitoring.md

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-# Usage monitoring
+# Usage Monitoring
+
+Usage monitoring in system design refers to the practice of monitoring the usage of a system, service, or application, in order to understand how it is being used and identify any potential issues or areas for improvement. This is an important aspect of ensuring that a system is meeting the needs of users and providing value.
+
+Usage monitoring typically includes the following components:
+
+- Data collection
+- Data analysis and visualization
+- Alerts and notifications
+- Trend analysis
+
+Learn more from the following links:
+
+- [What is Usage Monitoring?](https://patterns.arcitura.com/cloud-computing-patterns/design_patterns/usage_monitoring)

src/roadmaps/system-design/content/117-monitoring/105-instrumentation.md

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 # Instrumentation
+
+
+
+Learn more from the following links:
+
+- [Instrumentation System Docs](http://eolss.net/Sample-Chapters/C05/E6-39A-04-08.pdf)

src/roadmaps/system-design/content/117-monitoring/106-visualization-and-alerts.md

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-# Visualization and alerts
+# Visualization and Alerts
+
+Instrumentation in system design refers to the process of adding monitoring and measurement capabilities to a system, service, or application. This allows developers and operations teams to observe the behavior of the system, measure its performance, and identify any issues or areas for improvement.
+
+Instrumentation can be used to monitor a wide variety of aspects of a system, such as:
+
+- Performance: Instrumentation can be used to measure the performance of a system, such as response time, throughput, and resource utilization.
+- Errors: Instrumentation can be used to detect and diagnose errors, such as exceptions and stack traces.
+- Security: Instrumentation can be used to monitor for security-related events, such as authentication attempts and network traffic.
+- Usage: Instrumentation can be used to monitor usage-related data, such as the number of users and requests.
+
+To learn more, visit the following links:
+
+- [Visualize Data and Raise Alerts](https://learn.microsoft.com/en-us/azure/architecture/framework/devops/monitor-visualize-data)

src/roadmaps/system-design/content/117-monitoring/index.md

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 # Monitoring
+
+System monitoring involves the continuous monitoring of an infrastructure – aka an IT system – by an IT manager. It includes the monitoring of CPU, server memory, routers, switches, bandwidth, and applications, as well as the performance and availability of important network devices.
+
+Visit the following to learn more:
+
+- [Design and implement a monitoring system](https://www.tdh.ch/sites/default/files/tdh_gmm_en_nouvelleversion_ang.pdf)
+- [System Design — Design a Monitoring System](https://gongybable.medium.com/system-design-design-a-monitoring-system-f0f0cbafc895)