Update README.md

README.md

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+---
+gitea: none
+include_toc: true
+---
+
+# Smon
+
+Smon (Simple Monitoring) is a small and easy to maintain single user monitoring system. \
+It is developed for the developer's personal need for monitoring a small number of datapoints and get notifications,
+without having to maintain a huge system like Zabbix. \
+It is also possible to troubleshoot with historial data and graphs.
+
+There is no concept of users or passwords. \
+If a requirement, authentiation and authorization can be handled by a HTTP reverse proxy.
+
+All data is sent to the system via an HTTP request to /entry/`datapoint_name`. \
+Smon can't poll data.
+
 # Quick start
 
-1) Create an empty database
-1) Create the configuration file (default ~/.config/smon.yaml)
-1) Run ./smon (will create the database schema)
+1) Create an empty database (smon only supports PostgreSQL).
+1) Create the configuration file (default ~/.config/smon.yaml).
+1) Run ./smon (will create the database schema).
 
-# Configuration
+## Configuration
 
 ```yaml
 network:
@@ -28,17 +46,97 @@ application:
   nodata_interval: 60
 ```
 
-# Data from systems to datapoints
+## Sending data to datapoints
 
 `curl -d 200 http://localhost:9000/entry/datapoint_name`
 
-## Datetime format
-
-Datetime data is to be in the format of `2006-01-02T15:04:05+02:00` or `2006-01-02T15:04:05+0200`.
-
 Use `date '+%FT%T%z'` to get a value from systems in correct format.
 
-# Theming
+
+
+
+# Concepts
+
+Core concepts in Smon are:
+* datapoints.
+* triggers.
+* problems.
+* notifications.
+* areas.
+
+## Datapoints
+
+A datapoint has a unique name. Recommended is to use only a-z, A-Z, 0-9, dots, dashes and underscores for easier handling in URLs and trigger conditions.
+
+There are three data types:
+* INT.
+* STRING.
+* DATETIME.
+
+INT accepts values like -100, 0, 137 and 29561298561 and is stored in the int8 postgresql type.
+
+STRING is text data and stored by an unlimited varchar.
+
+DATETIME is a date with time and timezone in the format of `2006-01-02T15:04:05+02:00` or `2006-01-02T15:04:05+0200`. Stored in a field of timestamptz.
+
+Recommended is to provide from where (machine, system or script location...) the data is being pushed to Smon in the comment field.
+
+## Triggers
+
+Triggers have datapoints the expression is being able to use.
+
+Expressions are written with the [[https://expr-lang.org/|Expr]] language. See the [[https://expr-lang.org/docs/language-definition|language reference]] for available functions and syntax.
+
+The trigger is evaluating the expression when data is entered through the /entry/`datapoint_name` URL and a problem is issued when the expression returns `true`.
+
+## Problems
+
+One or more datapoints that trips a trigger issues a problem.
+
+Problems are archived in the database and can be looked up historically.
+
+A page of current problems is available to see the current problem state, either as a list or categorised.
+
+Problems can be acknowledged if they are known problems that will not be currently fixed.
+
+## Notifications
+
+Smon has a couple of notification services (currently [[https://ntfy.sh|NTFY]] and script).
+
+Services are added with a prio. The service with the lowest prio is tried first. \
+If sending through the service fails, the next service is tried and so on until one succeeds.
+
+What is sent isn't configurable (for now). What is sent is:
+* PROBLEM (when a problem is created) or OK (when a trigger evaluates to false).
+* Trigger name
+
+## NTFY
+
+An URL is provided to the topic which should receive the notifications.
+
+## Script
+
+The script service is defined with a filename.
+
+The script is called with three parameters:
+1) Problem ID
+1) Acknowledge URL
+1) Message
+
+## Areas
+
+Go to the `Config` icon to add areas. These are available to categorize triggers and problems for easier troubleshooting.
+
+Each area has sections to further group problems and triggers.
+
+
+
+
+# Development
+
+A couple of small notes on development.
+
+## Theming
 
 * Add theme to select tag in `/views/pages/configuration.gotmpl`.
 * Create `/static/less/theme-<theme-name>.less`.