add ubuntu installation for grafana and prometheus

Author: Killpit

Installation/Grafana/ubuntu-debian-install.md

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+# Install using APT repository in Ubuntu or Debian
+
+## Install packages 
+
+```sudo apt-get install -y apt-transport-https software-properties-common wget```
+
+## Import GPG key
+
+```sudo mkdir -p /etc/apt/keyrings/```
+```wget -q -O - https://apt.grafana.com/gpg.key | gpg --dearmor | sudo tee /etc/apt/keyrings/grafana.gpg > /dev/null```
+
+## Add repository for stable release
+
+```echo "deb [signed-by=/etc/apt/keyrings/grafana.gpg] https://apt.grafana.com stable main" | sudo tee -a /etc/apt/sources.list.d/grafana.list```
+
+## Update the list of available packages
+
+```sudo apt-get update```
+
+## Install Grafana OSS 
+
+```sudo apt-get install grafana```

Installation/Prometheus/ubuntu-debian-installation.md

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+# Linux Installation for Prometheus
+
+## Using pre-compiled binaries
+
+```wget https://github.com/prometheus/prometheus/releases/download/v2.51.0/prometheus-2.51.0.linux-amd64.tar.gz```
+
+## Extracting files
+
+```tar -xvf prometheus-2.51.0-rc.0.linux-amd64.tar.gz```
+
+## Go inside prometheus
+
+```cd prometheus-2.51.0-rc.0.linux-amd64/```
+
+## Run prometheus in background
+
+After you're on the main directory and found out `prometheus`, execute the file
+
+```./prometheus &```