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+## NetData
+
+[NetData](http://my-netdata.io/) is a system for **distributed real-time performance and health monitoring**.
+It provides **unparalleled insights, in real-time**, of everything happening on the
+system it runs (including applications such as web and database servers), using
+**modern interactive web dashboards**.
+
+_netdata is **fast** and **efficient**, designed to permanently run on all systems
+(**physical** & **virtual** servers, **containers**, **IoT** devices), without
+disrupting their core function._
+
+[](https://install-app.yunohost.org/?app=piwigo)
+
+**Customization brought by the package:**
+
+* grant MySQL statistics access via a `netdata` user
+* nginx root log statistics via putting `netdata` user in the `adm` group
+* Dovecot statistics via giving access to Dovecot stats stocket to `netdata` user (works only with Dovecot 2.2.16+)
+
+**Further recommendations:**
+We don't allow YunoHost packages to make sensible changes to system files. So here are further customizations you can make to allow more monitoring:
+
+* Nginx:
+ * requests/connections: follow [these recommandations](https://github.com/firehol/netdata/tree/master/python.d#nginx) to enable `/stab_status` (for example by putting the `location` section in `/etc/nginx/conf.d/yunohost_admin.conf`
+ * weblogs: you can monitor all your nginx weblogs for errors; follow [these recommendations](https://github.com/firehol/netdata/tree/master/python.d#nginx_log)
+* phpfpm: follow [these recommandations](https://github.com/firehol/netdata/tree/master/python.d#phpfpm)
+
+## Features
+
+
+
+
+
+ - **Stunning interactive bootstrap dashboards**
+ mouse and touch friendly, in 2 themes: dark, light
+
+ - **Amazingly fast**
+ responds to all queries in less than 0.5 ms per metric,
+ even on low-end hardware
+
+ - **Highly efficient**
+ collects thousands of metrics per server per second,
+ with just 1% CPU utilization of a single core, a few MB of RAM and no disk I/O at all
+
+ - **Sophisticated alarming**
+ hundreds of alarms, **out of the box**!
+ supports dynamic thresholds, hysteresis, alarm templates,
+ multiple role-based notification methods (such as email, slack.com,
+ pushover.net, pushbullet.com, telegram.org, twilio.com, messagebird.com)
+
+ - **Extensible**
+ you can monitor anything you can get a metric for,
+ using its Plugin API (anything can be a netdata plugin,
+ BASH, python, perl, node.js, java, Go, ruby, etc)
+
+ - **Embeddable**
+ it can run anywhere a Linux kernel runs (even IoT)
+ and its charts can be embedded on your web pages too
+
+ - **Customizable**
+ custom dashboards can be built using simple HTML (no javascript necessary)
+
+ - **Zero configuration**
+ auto-detects everything, it can collect up to 5000 metrics
+ per server out of the box
+
+ - **Zero dependencies**
+ it is even its own web server, for its static web files and its web API
+
+ - **Zero maintenance**
+ you just run it, it does the rest
+
+ - **scales to infinity**
+ requiring minimal central resources
+
+ - **several operating modes**
+ autonomous host monitoring, headless data collector, forwarding proxy, store and forward proxy, central multi-host monitoring, in all possible configurations.
+ Each node may have different metrics retention policy and run with or without health monitoring.
+
+ - **time-series back-ends supported**
+ can archive its metrics on `graphite`, `opentsdb`, `prometheus`, json document DBs, in the same or lower detail
+ (lower: to prevent it from congesting these servers due to the amount of data collected)
+
+
+
+---
+
+## What does it monitor?
+
+netdata collects several thousands of metrics per device.
+All these metrics are collected and visualized in real-time.
+
+> _Almost all metrics are auto-detected, without any configuration._
+
+This is a list of what it currently monitors:
+
+- **CPU**
+ usage, interrupts, softirqs, frequency, total and per core, CPU states
+
+- **Memory**
+ RAM, swap and kernel memory usage, KSM (Kernel Samepage Merging), NUMA
+
+- **Disks**
+ per disk: I/O, operations, backlog, utilization, space, software RAID (md)
+
+ 
+
+- **Network interfaces**
+ per interface: bandwidth, packets, errors, drops
+
+ 
+
+- **IPv4 networking**
+ bandwidth, packets, errors, fragments,
+ tcp: connections, packets, errors, handshake,
+ udp: packets, errors,
+ broadcast: bandwidth, packets,
+ multicast: bandwidth, packets
+
+- **IPv6 networking**
+ bandwidth, packets, errors, fragments, ECT,
+ udp: packets, errors,
+ udplite: packets, errors,
+ broadcast: bandwidth,
+ multicast: bandwidth, packets,
+ icmp: messages, errors, echos, router, neighbor, MLDv2, group membership,
+ break down by type
+
+- **Interprocess Communication - IPC**
+ such as semaphores and semaphores arrays
+
+- **netfilter / iptables Linux firewall**
+ connections, connection tracker events, errors
+
+- **Linux DDoS protection**
+ SYNPROXY metrics
+
+- **fping** latencies
+ for any number of hosts, showing latency, packets and packet loss
+
+ 
+
+
+- **Processes**
+ running, blocked, forks, active
+
+- **Entropy**
+ random numbers pool, using in cryptography
+
+- **NFS file servers and clients**
+ NFS v2, v3, v4: I/O, cache, read ahead, RPC calls
+
+- **Network QoS**
+ the only tool that visualizes network `tc` classes in realtime
+
+ 
+
+- **Linux Control Groups**
+ containers: systemd, lxc, docker
+
+- **Applications**
+ by grouping the process tree and reporting CPU, memory, disk reads,
+ disk writes, swap, threads, pipes, sockets - per group
+
+ 
+
+- **Users and User Groups resource usage**
+ by summarizing the process tree per user and group,
+ reporting: CPU, memory, disk reads, disk writes, swap, threads, pipes, sockets
+
+- **Apache and lighttpd web servers**
+ `mod-status` (v2.2, v2.4) and cache log statistics, for multiple servers
+
+- **Nginx web servers**
+ `stub-status`, for multiple servers
+
+- **Tomcat**
+ accesses, threads, free memory, volume
+
+- **web server log files**
+ extracting in real-time, web server performance metrics and applying several health checks
+
+- **mySQL databases**
+ multiple servers, each showing: bandwidth, queries/s, handlers, locks, issues,
+ tmp operations, connections, binlog metrics, threads, innodb metrics, and more
+
+- **Postgres databases**
+ multiple servers, each showing: per database statistics (connections, tuples
+ read - written - returned, transactions, locks), backend processes, indexes,
+ tables, write ahead, background writer and more
+
+- **Redis databases**
+ multiple servers, each showing: operations, hit rate, memory, keys, clients, slaves
+
+- **mongodb**
+ operations, clients, transactions, cursors, connections, asserts, locks, etc
+
+- **memcached databases**
+ multiple servers, each showing: bandwidth, connections, items
+
+- **elasticsearch**
+ search and index performance, latency, timings, cluster statistics, threads statistics, etc
+
+- **ISC Bind name servers**
+ multiple servers, each showing: clients, requests, queries, updates, failures and several per view metrics
+
+- **NSD name servers**
+ queries, zones, protocols, query types, transfers, etc.
+
+- **Postfix email servers**
+ message queue (entries, size)
+
+- **exim email servers**
+ message queue (emails queued)
+
+- **Dovecot** POP3/IMAP servers
+
+- **ISC dhcpd**
+ pools utilization, leases, etc.
+
+- **IPFS**
+ bandwidth, peers
+
+- **Squid proxy servers**
+ multiple servers, each showing: clients bandwidth and requests, servers bandwidth and requests
+
+- **HAproxy**
+ bandwidth, sessions, backends, etc
+
+- **varnish**
+ threads, sessions, hits, objects, backends, etc
+
+- **OpenVPN**
+ status per tunnel
+
+- **Hardware sensors**
+ `lm_sensors` and `IPMI`: temperature, voltage, fans, power, humidity
+
+- **NUT and APC UPSes**
+ load, charge, battery voltage, temperature, utility metrics, output metrics
+
+- **PHP-FPM**
+ multiple instances, each reporting connections, requests, performance
+
+- **hddtemp**
+ disk temperatures
+
+- **smartd**
+ disk S.M.A.R.T. values
+
+- **SNMP devices**
+ can be monitored too (although you will need to configure these)
+
+- **statsd**
+ [netdata is a fully featured statsd server](https://github.com/firehol/netdata/wiki/statsd)
+
+And you can extend it, by writing plugins that collect data from any source, using any computer language.
+
+## Links
+
+ * Report a bug: https://github.com/YunoHost-Apps/netdata_ynh/issues
+ * NetData website: http://my-netdata.io/
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