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+# PROMETHEUS LEARNING STATUS
+Last Updated: 2026-05-11 14:44:00
+Current IDE: VS Code
+
+## Goal
+Monitor 7 remote Linux servers from one central server.
+*Currently in testing phase using 2 Windows systems (Laptop & Desktop).*
+Central server: [Windows Laptop/Desktop - PENDING IP]
+Remote servers: 
+- Test Server 1 (Windows): [PENDING IP]
+- Prod Servers 1-7 (Linux): [PENDING IPs]
+
+## Current Position
+Layer: Layer 4 — PromQL
+Concept: Basic Syntax and Instant Vectors
+Drill: not done
+
+## Setup Status
+- [ ] Prometheus installed on central server
+- [ ] Prometheus UI accessible at port 9090
+- [ ] Grafana installed on central server
+- [ ] Grafana UI accessible at port 3000
+- [ ] Alertmanager installed on central server
+- [ ] Node Exporter on server 1: [PENDING]
+- [ ] Node Exporter on server 2: [PENDING]
+- [ ] Node Exporter on server 3: [PENDING]
+- [ ] Node Exporter on server 4: [PENDING]
+- [ ] Node Exporter on server 5: [PENDING]
+- [ ] Node Exporter on server 6: [PENDING]
+- [ ] Node Exporter on server 7: [PENDING]
+- [ ] All 7 servers showing UP in Prometheus Targets
+- [ ] Node Exporter Full dashboard imported in Grafana
+- [ ] Alert rules configured and showing in Prometheus
+- [ ] Alert notification received successfully
+
+## Layer Progress
+
+### Layer 1 — Mental Model
+- [x] Pull vs push model
+- [x] Time series data concept
+- [x] Four components understood
+- [x] Architecture drawn for 7 servers
+- [x] Four metric types
+Revision Task: [x] DONE
+
+### Layer 2 — Installing Prometheus
+- [x] File system structure
+- [x] Download and extract
+- [x] prometheus user created
+- [x] Directories and permissions
+- [x] Binaries in correct location
+- [x] First prometheus.yml written
+- [x] systemd service created
+- [x] Prometheus running and accessible
+Revision Task: [x] DONE
+
+### Layer 3 — Node Exporter
+- [x] What Node Exporter does
+- [x] /metrics format understood
+- [x] Installation on remote server
+- [ ] systemd service for node_exporter
+- [ ] /metrics verified with curl
+- [ ] Firewall configured correctly
+- [x] Connectivity from central server tested
+- [x] Server added to prometheus.yml
+- [x] Target showing UP in Prometheus
+- [ ] Repeated for all 7 servers
+Revision Task: [x] DONE
+
+### Layer 4 — PromQL
+- [x] Instant vs range vectors
+- [x] Label selectors
+- [x] rate() function
+- [x] CPU query
+- [x] RAM query
+- [x] Disk query
+- [x] Network query
+- [x] Up/Down query
+- [x] Aggregation operators
+- [ ] Expression browser used
+Revision Task: [ ] NOT DONE
+
+### Layer 5 — Grafana
+- [x] Installation
+- [x] Prometheus data source added
+- [x] Dashboard 1860 imported
+- [ ] Custom dashboard created
+- [ ] Variables configured
+- [ ] 6 panels built
+Revision Task: [ ] NOT DONE
+
+### Layer 6 — Alertmanager
+- [ ] Installation
+- [ ] alertmanager.yml configured
+- [ ] Email or Slack receiver set up
+- [ ] Alert rules file created
+- [ ] ServerDown alert written
+- [ ] HighCPU alert written
+- [ ] DiskSpaceLow alert written
+- [ ] HighMemory alert written
+- [ ] Alertmanager linked to Prometheus
+- [ ] Test alert received
+Revision Task: [ ] NOT DONE
+
+### Layer 7 — Config Deep Dive
+- [ ] scrape_configs deep dive
+- [ ] Labels mastered
+- [ ] Relabeling understood
+- [ ] Recording rules
+- [ ] promtool validation
+Revision Task: [ ] NOT DONE
+
+### Layer 8 — Security
+- [ ] TLS for Prometheus UI
+- [ ] Basic auth configured
+- [ ] nginx reverse proxy
+- [ ] Node Exporter access restricted
+- [ ] Storage retention configured
+- [ ] Backup strategy in place
+Revision Task: [ ] NOT DONE
+
+### Layer 9 — Docker Setup
+- [ ] docker-compose.yml written
+- [ ] Volumes configured
+- [ ] Stack running in Docker
+- [ ] Node Exporter Docker vs bare metal decision
+Revision Task: [ ] NOT DONE
+
+### Layer 10 — Advanced Features
+- [ ] file_sd_configs
+- [ ] Cloud service discovery concept
+- [ ] Pushgateway concept
+- [ ] Additional exporters
+- [ ] Custom exporter in Python
+- [ ] Federation concept
+- [ ] Long-term storage concept
+Revision Task: [ ] NOT DONE
+
+### Layer 11 — Troubleshooting
+- [ ] Target DOWN debugging steps
+- [ ] Metrics wrong debugging
+- [ ] Disk usage management
+- [ ] Memory management
+- [ ] Alert not firing debugging
+- [ ] Grafana no data debugging
+- [ ] Config validation process
+Revision Task: [ ] NOT DONE
+
+### Layer 12 — Apex Project
+- [ ] Full setup from scratch — complete
+
+## My Weak Spots
+[None yet]
+
+## Bridge Map Learned
+- Pull Model -> Central server running `setInterval()` with Axios GET requests to 7 dumb servers.
+- Time Series Data -> `metric_name{labels} value timestamp` (Labels are like MongoDB fields).
+- Architecture -> Remote: Node Exporter. Central: Prometheus, Grafana, Alertmanager. PULL direction.
+- Linux Folders -> `/etc` (configs/.env), `/var/lib` (MongoDB storage), `/usr/local/bin` (node.exe executable).
+
+## Common Errors Encountered
+[None yet]
+
+## Spaced Repetition Queue
+[None yet]
+
+## IDE Transfer Log
+[None yet]