From a7d8c714099af635531be4828bbc88a99a7a7636 Mon Sep 17 00:00:00 2001
From: Pavel Siska <siska@cesnet.cz>
Date: Sun, 6 Oct 2024 15:58:34 +0200
Subject: [PATCH] examples - add README.md

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+# Telemetry Example
+
+## Overview
+
+This example demonstrates two different telemetry applications: a simple example and an advanced example.
+The simple example showcases the basic functionality of the telemetry system, providing essential information
+such as process ID, start time, uptime, and version. The advanced example, on the other hand, offers a more
+comprehensive telemetry data structure that organizes and stores metrics from multiple servers located in
+different data centers.
+
+## Simple Example
+
+The simple example allows users to quickly access fundamental telemetry information.
+The resulting directory structure after running the simple example is as follows:
+
+```bash
+$ tree /tmp/telemetry/
+tmp/telemetry/
+├── parameters
+├── pid
+├── start_time
+├── uptime
+└── version
+```
+
+Example output from the files in the telemetry directory:
+
+```bash
+$ cat /tmp/telemetry/*
+./simple-example /tmp/telemetry/    # parameters
+1528349                             # pid
+2024-10-07 15:30:22                 # start_time
+154 (s)                             # uptime
+1.0.0                               # version
+```
+## Advanced Example
+
+The advanced example demonstrates a telemetry data structure that organizes and stores metrics from multiple
+servers located in different data centers. This structure allows for efficient retrieval and monitoring of key
+telemetry metrics such as CPU usage, memory usage, latency, and disk usage.
+
+The resulting directory structure after running the advanced example is as follows:
+
+```bash
+$ tree /tmp/telemetry
+/tmp/telemetry
+└── data_centers
+    ├── new_york
+    │   ├── server_count
+    │   ├── servers
+    │   │   ├── server_0
+    │   │   │   └── stats
+    │   │   ├── server_1
+    │   │   │   └── stats
+    │   │   └── server_2
+    │   │       └── stats
+    │   └── summary
+    │       └── summary_stats
+    ├── prague
+    │   ├── server_count
+    │   ├── servers
+    │   │   ├── server_0
+    │   │   │   └── stats
+    │   │   ├── server_1
+    │   │   │   └── stats
+    │   │   └── server_2
+    │   │       └── stats
+    │   └── summary
+    │       └── summary_stats
+    └── tokyo
+        ├── server_count
+        ├── servers
+        │   ├── server_0
+        │   │   └── stats
+        │   ├── server_1
+        │   │   └── stats
+        │   └── server_2
+        │       └── stats
+        └── summary
+            └── summary_stats
+```
+
+### Example of Telemetry Output
+
+Here is an example of the contents of the `stats` file for a specific server:
+
+```bash
+$ cat /tmp/telemetry/data_centers/prague/servers/server_0/stats
+cpu_usage:    74.28 (%)
+disk_usage:   13.48 (%)
+latency:      170.20 (ms)
+memory_usage: 31.17 (%)
+timestamp:    2024-10-03 15:18:41
+```
+
+Example of the contents of the `summary_stats` file for a data center:
+
+```bash
+$ cat /tmp/telemetry/data_centers/prague/summary/summary_stats
+cpu_usage [avg]:    44.20 (%)
+disk_usage [avg]:   35.78 (%)
+latency [avg]:      121.82 (ms)
+latency [max]:      193.88 (ms)
+latency [min]:      7.04 (ms)
+memory_usage [avg]: 54.20 (%)
+```
+
+## How to build & run
+
+### Build
+To build the examples, simply run the following command in the root of the project:
+
+```bash
+make example
+```
+
+### Run
+
+Once the build is complete, you can run the examples by specifying the desired mount point:
+
+```bash
+./simple-example <mount_point>
+# or
+./advanced-example <mount_point>
+```
+For example:
+
+```bash
+./simple-example /tmp/telemetry
+```