Added Prometheus

Prometheus/prometheus.md

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+# Getting Started with Prometheus
+## Introduction
+- Written in GO
+- Time series database + Web Server + Engine
+- Data is collected regularly
+- Good balance between In-memory storage and disk storage
+- Data structur: key / timestamp / value
+- Double delta is possible to limit storage usage: data is written only if changed.
+
+## Installation de prometheus
+### Docker installation
+```
+docker run -d --name prometheus -v $PWD/etc/:/etc/prometheus/ -v $PWD/data/:/prometheus/ -p 9090:9090 quay.io/prometheus/prometheus:v2.33.5
+```
+### Debian installation
+```bash
+sudo apt-get install prometheus
+```
+
+## Configuration 
+```
+$ cat /etc/prometheus/prometheus.yml
+# Sample config for Prometheus.
+
+global:
+  scrape_interval:     15s # Set the scrape interval to every 15 seconds. Default is every 1 minute.
+  evaluation_interval: 15s # Evaluate rules every 15 seconds. The default is every 1 minute.
+  # scrape_timeout is set to the global default (10s).
+
+  # Attach these labels to any time series or alerts when communicating with
+  # external systems (federation, remote storage, Alertmanager).
+  external_labels:
+      monitor: 'example'
+
+# Alertmanager configuration
+alerting:
+  alertmanagers:
+  - static_configs:
+    - targets: ['localhost:9093']
+
+# Load rules once and periodically evaluate them according to the global 'evaluation_interval'.
+rule_files:
+  # - "first_rules.yml"
+  # - "second_rules.yml"
+
+# A scrape configuration containing exactly one endpoint to scrape:
+# Here it's Prometheus itself.
+scrape_configs:
+  # The job name is added as a label `job=<job_name>` to any timeseries scraped from this config.
+  - job_name: 'prometheus'
+
+    # Override the global default and scrape targets from this job every 5 seconds.
+    scrape_interval: 5s
+    scrape_timeout: 5s
+
+    # metrics_path defaults to '/metrics'
+    # scheme defaults to 'http'.
+
+    static_configs:
+      - targets: ['localhost:9090']
+
+  - job_name: node
+    # If prometheus-node-exporter is installed, grab stats about the local
+    # machine by default.
+    static_configs:
+      - targets: ['localhost:9100']
+
+```
+
+<br>
+
+
+## Reload de configuration
+
+```
+curl -X POST http://localhost:9090/-/reload
+```
+
+<br>
+