Add monitoring.

[Hjaltesorgenfrei]

We need monitoring in our app. We should monitor the following:

• Average CPU Load.
• Logins per day.
• Average response time for different pages.
• Average response time per api function
• Up time for server
• Average Requests per second
• Average Messages per second
• Number of users
• Number of messages
• Average number of followers per user.
• Average user interactions with page
• Graphs for number growths.
• How long does the different database queries take.
• How often do we query it.
• Load per application
• Memory usage per application
• Check if programs were killed due to excessive memory consumption
• Monitor if network is up
• Monitoring of load and requests per IP
• Disk space
• Average response time per repository function

If we want anything else monitored, please add it to the list.

[jlndk]

My todo:

• Graph requests per route
• Average requests over last 10 minutes metric
• Add PostgreSQL as a data provider
• Statistic: User count
• Statistic: Message count
• Statistic: Average number of followers per user
• Metadata about postgres (average response time, resource utilization, etc)