Feature/lab8

.github/pull_request_template.md

@@ -0,0 +1,8 @@
+## Goal
+- 
+## Changes
+- 
+## Checklist
+- [ ] Clear, descriptive PR title
+- [ ] Documentation/README updated (if needed)
+- [ ] No secrets or large temporary files committed

.github/workflows/lab3.yml

@@ -0,0 +1,25 @@
+name: Lab 3 CI Workflow
+on:
+  push:
+    branches: [ main, feature/lab3 ]
+  workflow_dispatch:
+jobs:
+  system-info:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Task 1 - Hello World
+        run: echo "The pipeline is working"
+      - name: Task 2 - System Information
+        run: |
+          echo "=== OS Information ==="
+          uname -a
+          echo "=== CPU Information ==="
+          nproc
+          lscpu | grep "Model name"
+          echo "=== Memory Information ==="
+          free -h
+          echo "=== Disk Space ==="
+          df -h
+          echo "=== GitHub Runner Details ==="
+          echo "Runner OS: ${{ runner.os }}"
+          echo "Workflow: ${{ github.workflow }}"

labs/submission8.md

@@ -0,0 +1,66 @@
+# Lab 8 Submission — Site Reliability Engineering (SRE)
+
+## Task 1 — Key Metrics for SRE and System Analysis
+
+### 1.1: Resource Consumption Analysis
+
+**Top 3 Most Consuming Applications:**
+
+| Metric | Top 1 | Top 2 | Top 3 |
+| --- | --- | --- | --- |
+| **CPU Usage** | LibreWolf | cosmic-comp | htop |
+| **Memory Usage** | LibreWolf | cosmic-comp | Telegram |
+| **I/O Usage** | rsyslogd | Docker (Volumes) | systemd-journald |
+
+**iostat Output Snippet:**
+```text
+avg-cpu:  %user   %nice %system %iowait  %steal   %idle
+           0.46    3.17    1.13    0.03    0.00   95.21
+
+Device            r/s     rkB/s     w/s     wkB/s    %util
+nvme0n1          1.70     73.01   13.64    707.77     0.22
+```
+
+---
+
+
+### 1.2: Disk Space Management
+
+**Top 3 Largest Files in `/var`:**
+1. `1.2G` — `/var/log/syslog`
+2. `931M` — `/var/lib/docker/volumes/.../me-...-big-Data.db`
+3. `913M` — `/var/lib/docker/volumes/.../me-...-big-Data.db`
+
+**Analysis:**
+The system's primary partition is at 83% capacity, with 345GB used out of 440GB. While the majority of the space is occupied by my personal data in the home directory, the `/var` directory occupies a significant 27GB. Within `/var`, Docker volumes are the dominant consumer, accounting for 22GB (over 80% of `/var`). The 1.2GB `syslog` file is also notable, as it indicates a very high volume of system events.
+
+**Optimization Reflection:**
+To improve reliability, I would implement more aggressive log rotation for `syslog` and perform a `docker system prune --volumes` to reclaim space from unused containers. Reducing disk saturation below 80% is a key SRE objective to prevent filesystem performance degradation.
+
+---
+
+## Task 2 — Practical Website Monitoring Setup
+
+**Target Website:** `https://www.google.com`
+
+### 2.1: Monitoring Configuration
+I configured an API Check to verify basic 200 OK availability and a Browser Check using Playwright to validate that the page title contains "Google."
+
+**Browser Check Configuration:**
+![Browser Check](https://i.ibb.co.com/VpkhWnC1/Screenshot-2026-03-26-20-53-13.png)
+
+### 2.2: Successful Run Evidence
+All checks are executing successfully from global runners (Frankfurt/London).
+![Browser Check Success](https://i.ibb.co.com/q3LBZh4B/Screenshot-2026-03-26-20-55-39.png)
+
+### 2.3: Alerting and Dashboard
+I configured email alerts to my personal email to trigger immediately upon any check failure, ensuring fast error detection.
+
+**Alert Settings:**
+![Alert Settings](https://i.ibb.co.com/WpKpkyvC/Screenshot-2026-03-26-20-55-24.png)
+
+**Dashboard Overview:**
+![Dashboard Overview](https://i.ibb.co.com/G38K35Kt/Screenshot-2026-03-26-20-55-08.png)
+
+### Analysis & Reflection
+I chose these specific checks to cover both "Availability" (API Check) and "Correctness" (Browser Check). A site might return a 200 status but show a blank page; the Browser Check ensures the user actually sees the expected content. This setup helps maintain the Service Level Objective (SLO) by providing real-time visibility into the user experience.