====== Grafana ======
https://grafana.com\\
https://hub.docker.com/r/grafana/grafana/\\
https://grafana.com/docs/grafana/latest/administration/configure-docker/

Конфиг - /etc/grafana/grafana.ini

===== Некоторые метрики =====

<code bash>
# CPU
node_load1
node_load5
node_load15
# CPU в процентах
100 - (avg(irate(node_cpu_seconds_total{mode="idle"}[30m])) * 100)
# RAM (MiB)
node_memory_MemFree_bytes / 1024 / 1024
node_memory_MemTotal_bytes / 1024 / 1024
# HDD (GiB)
node_filesystem_free_bytes{mountpoint="/"} / 1024 / 1024 / 1024
node_filesystem_size_bytes{mountpoint="/"} / 1024 / 1024 / 1024
# Disk usage (GiB)
node_disk_read_bytes_total{device="sda"} / 1024 / 1024 / 1024
node_disk_written_bytes_total{device="sda"} / 1024 / 1024 / 1024
# System (from docker metrics)
engine_daemon_engine_info
# Legend: {{os}} {{architecture}} ({{kernel}})
# Docker {{version}}
# Boot time (Datetime default)
node_boot_time_seconds * 1000
# Uptime (Duration d hh:mm:ss)
node_time_seconds - node_boot_time_seconds
# Pending updates
apt_upgrades_pending
# Reboot required (+ value mapping)
node_reboot_required
# Services
count(node_systemd_unit_state{state="active"}!=0)
count(node_systemd_unit_state{state="inactive"}!=0)
count(node_systemd_unit_state{state="failed"}!=0)
# Docker containers status
engine_daemon_container_states_containers{state="running"}
engine_daemon_container_states_containers{state="stopped"}
engine_daemon_container_states_containers{state="paused"}
# Network
node_network_receive_bytes_total{device="eth0"} / 1024 / 1024
node_network_transmit_bytes_total{device="eth0"} / 1024 / 1024
# Текущий трафик по всем интерфейсам (включая Докер, loopback и т. д.)
sum(irate(node_network_receive_bytes_total[1m]))
sum(irate(node_network_transmit_bytes_total[1m]))
# Более аккуратный вариант
sum(irate(node_network_receive_bytes_total{device=~"(wlp1s0|enp3s0)"}[1m]))
sum(irate(node_network_transmit_bytes_total{device=~"(wlp1s0|enp3s0)"}[1m]))

# Выцепить несколько имён метрик
{__name__=~"metrics_containers_.*_cpu_percent"}
#metrics_containers_frigate_cpu_percent{instance="glances:9091", job="glances", src="glances"}	7.388715365239294
#metrics_containers_glances_cpu_percent{instance="glances:9091", job="glances", src="glances"}	0.6252216748768473
#metrics_containers_nc_cpu_percent{instance="glances:9091", job="glances", src="glances"}	0.0629145728643216
</code>

===== Настройка за реверс-прокси =====
Мало настроить реверс-прокси, нужно Графане рассказать, как работать.
<code>
[server]
domain = example.com
root_url = %(protocol)s://%(domain)s:%(http_port)s/grafana/
serve_from_sub_path = true
</code>
https://grafana.com/tutorials/run-grafana-behind-a-proxy/#1

===== Общий доступ к панели =====
[[https://stackoverflow.com/questions/33111835/how-to-set-up-grafana-so-that-no-password-is-necessary-to-view-dashboards|How to set up Grafana so that no password is necessary to view dashboards]]

https://grafana.com/docs/grafana/v7.5/auth/grafana/#anonymous-authentication

===== Показать значения ярлыков внутри метрики =====
К примеру, есть метрика вида
  node_uname_info{domainname="(none)", instance="172.17.0.1:9100", job="host", machine="x86_64", nodename="user-xubuntuVM", release="5.4.0-65-generic", sysname="Linux", version="#73-Ubuntu SMP Mon Jan 18 17:25:17 UTC 2021"} 1
Из неё нужно вытащить значение sysname и release.

{{:service:pasted:20210225-094434.png}}

Затем в правой колонке настроек выбрать
  * Visualization -> Stat
  * Display -> Text mode -> Name
  * Display -> Graph mode -> None

https://stackoverflow.com/questions/38525891/how-do-i-write-a-prometheus-query-that-returns-the-value-of-a-label