Merging upstream version 1.39.0.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

19 files changed, 278 insertions, 84 deletions

diff --git a/system/Makefile.am b/system/Makefile.am
index 1a1b41e26..13466639d 100644
--- a/system/Makefile.am
+++ b/system/Makefile.am
@@ -3,16 +3,18 @@
 
 MAINTAINERCLEANFILES = $(srcdir)/Makefile.in
 CLEANFILES = \
-    netdata-openrc \
-    netdata.logrotate \
-    netdata.service \
-    netdata.service.v235 \
-    netdata-init-d \
-    netdata-lsb \
-    netdata-freebsd \
-    netdata.plist \
-    netdata.crontab \
-    netdata-updater.service \
+    cron/netdata-updater-daily \
+    freebsd/rc.d/netdata \
+    initd/init.d/netdata \
+    launchd/netdata.plist \
+    logrotate/netdata \
+    lsb/init.d/netdata \
+    openrc/conf.d/netdata \
+    openrc/init.d/netdata \
+    runit/run \
+    systemd/netdata.service \
+    systemd/netdata.service.v235 \
+    systemd/netdata-updater.service \
     $(NULL)
 
 include $(top_srcdir)/build/subst.inc
@@ -26,44 +28,107 @@ dist_config_DATA = \
     .install-type \
     $(NULL)
 
+libconfigvnodesdir=$(libconfigdir)/vnodes
+libsyscrondir=$(libsysdir)/cron
+libsysfreebsddir=$(libsysdir)/freebsd
+libsysfreebsdrcddir=$(libsysfreebsddir)/rc.d
+libsysinitddir=$(libsysdir)/initd
+libsysinitdinitddir=$(libsysinitddir)/init.d
+libsyslaunchddir=$(libsysdir)/launchd
+libsyslogrotatedir=$(libsysdir)/logrotate
+libsyslsbdir=$(libsysdir)/lsb
+libsyslsbinitddir=$(libsyslsbdir)/init.d
+libsysopenrcdir=$(libsysdir)/openrc
+libsysopenrcinitddir=$(libsysopenrcdir)/init.d
+libsysopenrcconfddir=$(libsysopenrcdir)/conf.d
+libsysrunitdir=$(libsysdir)/runit
+libsyssystemddir=$(libsysdir)/systemd
+
 # Explicitly install directories to avoid permission issues due to umask
 install-exec-local:
 	$(INSTALL) -d $(DESTDIR)$(configdir)
 	$(INSTALL) -d $(DESTDIR)$(libsysdir)
+	$(INSTALL) -d $(DESTDIR)$(libsyscrondir)
+	$(INSTALL) -d $(DESTDIR)$(libsysfreebsdrcddir)
+	$(INSTALL) -d $(DESTDIR)$(libsysinitdinitddir)
+	$(INSTALL) -d $(DESTDIR)$(libsyslaunchddir)
+	$(INSTALL) -d $(DESTDIR)$(libsyslogrotatedir)
+	$(INSTALL) -d $(DESTDIR)$(libsyslsbinitddir)
+	$(INSTALL) -d $(DESTDIR)$(libsyssystemddir)
+	$(INSTALL) -d $(DESTDIR)$(libsysopenrcinitddir)
+	$(INSTALL) -d $(DESTDIR)$(libsysopenrcconfddir)
+	$(INSTALL) -d $(DESTDIR)$(libsysrunitdir)
+	$(INSTALL) -d $(DESTDIR)$(libconfigvnodesdir)
+
+dist_libconfigvnodes_DATA = \
+    vnodes/vnodes.conf
+    $(NULL)
 
 libexecnetdatadir=$(libexecdir)/netdata
 nodist_libexecnetdata_SCRIPTS = \
     install-service.sh \
     $(NULL)
 
-nodist_libsys_DATA = \
-    netdata-openrc \
-    netdata.logrotate \
-    netdata.service \
-    netdata.service.v235 \
-    netdata-init-d \
-    netdata-lsb \
-    netdata-freebsd \
-    netdata.plist \
-    netdata.crontab \
-    netdata-updater.service \
+nodist_libsyscron_DATA = \
+    cron/netdata-updater-daily \
+    $(NULL)
+
+nodist_libsysfreebsdrcd_DATA = \
+    freebsd/rc.d/netdata \
+    $(NULL)
+
+nodist_libsysinitdinitd_DATA = \
+    initd/init.d/netdata \
+    $(NULL)
+
+nodist_libsyslaunchd_DATA = \
+    launchd/netdata.plist \
+    $(NULL)
+
+nodist_libsyslogrotate_DATA = \
+    logrotate/netdata \
+    $(NULL)
+
+nodist_libsyslsbinitd_DATA = \
+    lsb/init.d/netdata \
+    $(NULL)
+
+nodist_libsysopenrcinitd_DATA = \
+    openrc/init.d/netdata \
+    $(NULL)
+
+nodist_libsysopenrcconfd_DATA = \
+    openrc/conf.d/netdata \
+    $(NULL)
+
+nodist_libsysrunit_DATA = \
+    runit/run \
+    $(NULL)
+
+nodist_libsyssystemd_DATA = \
+    systemd/netdata.service \
+    systemd/netdata.service.v235 \
+    systemd/netdata-updater.service \
     $(NULL)
 
-dist_libsys_DATA = \
-    netdata-updater.timer \
+dist_libsyssystemd_DATA = \
+    systemd/netdata-updater.timer \
+    systemd/50-netdata.preset
     $(NULL)
 
 dist_noinst_DATA = \
     install-service.sh.in \
-    netdata-openrc.in \
-    netdata.logrotate.in \
-    netdata.service.in \
-    netdata.service.v235.in \
-    netdata-init-d.in \
-    netdata-lsb.in \
-    netdata-freebsd.in \
-    netdata.plist.in \
     netdata.conf \
-    netdata.crontab.in \
-    netdata-updater.service.in \
+    cron/netdata-updater-daily.in \
+    freebsd/rc.d/netdata.in \
+    initd/init.d/netdata.in \
+    launchd/netdata.plist.in \
+    logrotate/netdata.in \
+    lsb/init.d/netdata.in \
+    openrc/conf.d/netdata.in \
+    openrc/init.d/netdata.in \
+    runit/run.in \
+    systemd/netdata.service.in \
+    systemd/netdata.service.v235.in \
+    systemd/netdata-updater.service.in \
     $(NULL)
diff --git a/system/netdata.crontab.in b/system/cron/netdata-updater-daily.in
index 8f0527e0e..8f0527e0e 100644
--- a/system/netdata.crontab.in
+++ b/system/cron/netdata-updater-daily.in
diff --git a/system/edit-config b/system/edit-config
index 754f9374a..96ee82d4f 100755
--- a/system/edit-config
+++ b/system/edit-config
@@ -34,10 +34,20 @@ error() {
 }
 
 abspath() {
-  if [ -d "${1}" ]; then
+  if [ -d "${1}/" ]; then
     echo "$(cd "${1}" && /usr/bin/env PWD= pwd -P)/"
-  else
+  elif [ -f "${1}" ]; then
     echo "$(cd "$(dirname "${1}")" && /usr/bin/env PWD= pwd -P)/$(basename "${1}")"
+  elif echo "${1}" | grep -q '/'; then
+    if echo "${1}" | grep -q '^/'; then
+      mkdir -p "$(dirname "${1}")"
+      echo "$(cd "$(dirname "${1}")" && /usr/bin/env PWD= pwd -P)/$(basename "${1}")"
+    else
+      mkdir -p "${script_dir}/$(dirname "${1}")"
+      echo "${script_dir}/${1}"
+    fi
+  else
+    echo "${script_dir}/${1}"
   fi
 }
 
@@ -153,7 +163,7 @@ list_files() {
   check_directories
   handle_container
 
-  if test -t; then
+  if test -t && command -v tput > /dev/null 2>&1; then
     width="$(tput cols)"
   fi
 
diff --git a/system/netdata-freebsd.in b/system/freebsd/rc.d/netdata.in
index fd544c86c..fd544c86c 100644
--- a/system/netdata-freebsd.in
+++ b/system/freebsd/rc.d/netdata.in
diff --git a/system/netdata-init-d.in b/system/initd/init.d/netdata.in
index c0257ffab..c0257ffab 100644
--- a/system/netdata-init-d.in
+++ b/system/initd/init.d/netdata.in
diff --git a/system/install-service.sh.in b/system/install-service.sh.in
index 59cff0a08..a885a8618 100755
--- a/system/install-service.sh.in
+++ b/system/install-service.sh.in
@@ -87,7 +87,7 @@ get_os_key() {
 valid_types() {
   case "${PLATFORM}" in
     Linux)
-      echo "detect systemd openrc lsb initd"
+      echo "detect ${LINUX_INIT_TYPES}"
       ;;
     FreeBSD)
       echo "detect freebsd"
@@ -102,7 +102,7 @@ valid_types() {
 }
 
 install_generic_service() {
-  svc_type="${1}"
+  svc_path="${1}"
   svc_type_name="${2}"
   svc_file="${3}"
   svc_enable_hook="${4}"
@@ -113,7 +113,7 @@ install_generic_service() {
     ENABLE="enable"
   fi
 
-  if ! install -p -m 0755 -o 0 -g 0 "${SVC_SOURCE}/netdata-${svc_type}" "${svc_file}"; then
+  if ! install -p -m 0755 -o 0 -g 0 "${SVC_SOURCE}/${svc_path}/netdata" "${svc_file}"; then
     error "Failed to install service file."
     exit 4
   fi
@@ -236,10 +236,12 @@ get_systemd_service_dir() {
 }
 
 install_systemd_service() {
-  SRCFILE="${SVC_SOURCE}/netdata.service"
+  SRCFILE="${SVC_SOURCE}/systemd/netdata.service"
+  PRESET_FILE="${SVC_SOURCE}/systemd/50-netdata.preset"
+  SVCDIR="$(get_systemd_service_dir)"
 
   if [ "$(systemctl --version | head -n 1 | cut -f 2 -d ' ')" -le 235 ]; then
-    SRCFILE="${SVC_SOURCE}/netdata.service.v235"
+    SRCFILE="${SVC_SOURCE}/systemd/netdata.service.v235"
   fi
 
   if [ "${ENABLE}" = "auto" ]; then
@@ -255,18 +257,24 @@ install_systemd_service() {
   fi
 
   info "Installing systemd service..."
-  if ! install -p -m 0644 -o 0 -g 0 "${SRCFILE}" "$(get_systemd_service_dir)/netdata.service"; then
+  if ! install -p -m 0644 -o 0 -g 0 "${SRCFILE}" "${SVCDIR}/netdata.service"; then
     error "Failed to install systemd service file."
     exit 4
   fi
 
+  if [ -f "${PRESET_FILE}" ]; then
+    if ! install -p -m 0644 -o 0 -g 0 "${PRESET_FILE}" "${SVCDIR}-preset/50-netdata.preset"; then
+      warning "Failed to install netdata preset file."
+    fi
+  fi
+
   if [ "$(check_systemd)" = "YES" ]; then
     if ! systemctl daemon-reload; then
-        warning "Failed to reload systemd unit files."
+      warning "Failed to reload systemd unit files."
     fi
 
-    if ! systemctl ${ENABLE} netdata; then
-        warning "Failed to ${ENABLE} Netdata service."
+    if ! systemctl "${ENABLE}" netdata; then
+      warning "Failed to ${ENABLE} Netdata service."
     fi
   fi
 }
@@ -290,6 +298,9 @@ _check_openrc() {
   # if there is no /etc/init.d, it's not OpenRC
   [ ! -d /etc/init.d ] && echo "NO" && return 0
 
+  # if there is no /etc/conf.d, it's not OpenRC
+  [ ! -d /etc/conf.d ] && echo "NO" && return 0
+
   # if there is no rc-update command, it's not OpenRC
   [ -z "$(command -v rc-update 2>/dev/null || true)" ] && echo "NO" && return 0
 
@@ -341,7 +352,15 @@ disable_openrc() {
 }
 
 install_openrc_service() {
-  install_generic_service openrc OpenRC /etc/init.d/netdata enable_openrc disable_openrc
+  install_generic_service openrc/init.d OpenRC /etc/init.d/netdata enable_openrc disable_openrc
+
+  if [ ! -f /etc/conf.d/netdata ]; then
+    info "Installing OpenRC configuration file."
+
+    if ! install -p -m 0755 -o 0 -g 0 "${SVC_SOURCE}/openrc/conf.d/netdata" "/etc/conf.d/netdata"; then
+        warning "Failed to install configuration file, however the service will still work."
+    fi
+  fi
 }
 
 openrc_cmds() {
@@ -399,7 +418,7 @@ disable_lsb() {
 }
 
 install_lsb_service() {
-  install_generic_service lsb LSB /etc/init.d/netdata enable_lsb disable_lsb
+  install_generic_service lsb/init.d LSB /etc/init.d/netdata enable_lsb disable_lsb
 }
 
 lsb_cmds() {
@@ -454,7 +473,7 @@ disable_initd() {
 }
 
 install_initd_service() {
-  install_generic_service init-d init.d /etc/init.d/netdata enable_initd disable_initd
+  install_generic_service initd/init.d init.d /etc/init.d/netdata enable_initd disable_initd
 }
 
 initd_cmds() {
@@ -464,8 +483,6 @@ initd_cmds() {
 
 # =====================================================================
 # runit support functions
-#
-# Currently not supported, this exists to provide useful error messages.
 
 _check_runit() {
   # if there is no runsvdir command, then it's not runit
@@ -492,19 +509,61 @@ check_runit() {
 }
 
 install_runit_service() {
-  error "Detected runit, which we do not currently support."
-  exit 3
+  if [ -d /etc/sv ]; then
+    svc_dir="/etc/sv/netdata"
+  elif [ -d /etc/runit/sv ]; then
+    svc_dir="/etc/runit/sv/netdata"
+  else
+    error "Failed to locate service directory"
+    exit 4
+  fi
+
+  if [ -d /service ]; then
+    live_svc_dir="/service"
+  elif [ -d /var/service ]; then
+    live_svc_dir="/var/service"
+  elif [ -d /run/runit/service ]; then
+    live_svc_dir="/run/runit/service"
+  elif [ -d /etc/runit/runsvdir/default ]; then
+    live_svc_dir="/etc/runit/runsvdir/default"
+  else
+    error "Failed to locate live service directory"
+    exit 4
+  fi
+
+  svc_file="${svc_dir}/run"
+
+  info "Installing runit service file."
+  if [ ! -f "${svc_file}" ] && [ "${ENABLE}" = "auto" ]; then
+    ENABLE="enable"
+  fi
+
+  if ! install -D -p -m 0755 -o 0 -g 0 "${SVC_SOURCE}/runit/run" "${svc_file}"; then
+    error "Failed to install service file."
+    exit 4
+  fi
+
+  case ${ENABLE} in
+    enable)
+      if ! ln -s "${svc_dir}" "${live_svc_dir}"; then
+        warning "Failed to enable the Netdata service."
+      fi
+      ;;
+    disable)
+      if ! rm "${live_svc_dir}/netdata"; then
+        warning "Failed to disable the Netdata service."
+      fi
+      ;;
+  esac
 }
 
 runit_cmds() {
-  error "Detected runit, which we do not currently support."
-  exit 3
+  NETDATA_START_CMD="sv start netdata"
+  NETDATA_STOP_CMD="sv stop netdata"
 }
 
 # =====================================================================
 # WSL support functions
-#
-# Cannot be supported, this exists to provide useful error messages.
 
 _check_wsl() {
   # If uname -r contains the string WSL, then it's WSL.
@@ -552,7 +611,7 @@ disable_freebsd() {
 }
 
 install_freebsd_service() {
-  install_generic_service freebsd "FreeBSD rc.d" /usr/local/etc/rc.d/netdata enable_freebsd disable_freebsd
+  install_generic_service freebsd/rc.d "FreeBSD rc.d" /usr/local/etc/rc.d/netdata enable_freebsd disable_freebsd
 }
 
 freebsd_cmds() {
@@ -566,7 +625,7 @@ freebsd_cmds() {
 
 install_darwin_service() {
   info "Installing macOS plist file for launchd."
-  if ! install -C -S -p -m 0644 -o 0 -g 0 system/netdata.plist /Library/LaunchDaemons/com.github.netdata.plist; then
+  if ! install -C -S -p -m 0644 -o 0 -g 0 system/launchd/netdata.plist /Library/LaunchDaemons/com.github.netdata.plist; then
     error "Failed to copy plist file."
     exit 4
   fi
@@ -633,7 +692,7 @@ detect_linux_svc_type() {
 install_linux_service() {
   t="$(detect_linux_svc_type)"
 
-  if [ -z "${t}" ]; then
+  if [ -z "${t}" ] || [ "${t}" = 'detect' ]; then
     exit 2
   fi
 
@@ -643,7 +702,7 @@ install_linux_service() {
 linux_cmds() {
   t="$(detect_linux_svc_type)"
 
-  if [ -z "${t}" ]; then
+  if [ -z "${t}" ] || [ "${t}" = 'detect' ]; then
     exit 2
   fi
 
diff --git a/system/netdata.plist.in b/system/launchd/netdata.plist.in
index a969b3177..a969b3177 100644
--- a/system/netdata.plist.in
+++ b/system/launchd/netdata.plist.in
diff --git a/system/netdata.logrotate.in b/system/logrotate/netdata.in
index 2c4949e5f..2c4949e5f 100644
--- a/system/netdata.logrotate.in
+++ b/system/logrotate/netdata.in
diff --git a/system/netdata-lsb.in b/system/lsb/init.d/netdata.in
index e429ad1c9..e429ad1c9 100644
--- a/system/netdata-lsb.in
+++ b/system/lsb/init.d/netdata.in
diff --git a/system/netdata.conf b/system/netdata.conf
index 70edb0828..94d9ab82c 100644
--- a/system/netdata.conf
+++ b/system/netdata.conf
@@ -1,6 +1,10 @@
 # netdata configuration
 #
-# You can download the latest version of this file, using:
+# You can get the latest version of this file, using:
+#
+#  netdatacli dumpconfig > /etc/netdata/netdata.conf
+#
+# You can also download it using:
 #
 #  wget -O /etc/netdata/netdata.conf http://localhost:19999/netdata.conf
 # or
diff --git a/system/openrc/conf.d/netdata.in b/system/openrc/conf.d/netdata.in
new file mode 100644
index 000000000..92f882608
--- /dev/null
+++ b/system/openrc/conf.d/netdata.in
@@ -0,0 +1,24 @@
+# The user netdata is configured to run as.
+# If you edit its configuration file to set a different user, set it
+# here too, to have its files switch ownership
+NETDATA_OWNER="@netdata_user_POST@:@netdata_user_POST@"
+
+# How long to wait for the agent to save it's database during shutdown.
+NETDATA_WAIT_EXIT_TIMEOUT=60
+
+# If set to 1, force an exit if we time out waiting for the agent to
+# save it's database during shutdown.
+NETDATA_FORCE_EXIT=0
+
+# If set to 1, use netdatacli when sending commands to the agent.
+# This should not be needed in most cases, but it can sometimes help
+# work around issues.
+#NETDATA_USE_NETDATACLI=1
+
+# Specify the path to the pidfile to be used when running in the
+# background.
+NETDATA_PIDFILE="@localstatedir_POST@/run/netdata/netdata.pid"
+
+# Uncomment the below line to run Netdata under OpenRC's native process
+# supervision.
+#supervisor="supervise-daemon"
diff --git a/system/netdata-openrc.in b/system/openrc/init.d/netdata.in
index 158878929..74242b3cb 100644
--- a/system/netdata-openrc.in
+++ b/system/openrc/init.d/netdata.in
@@ -1,37 +1,21 @@
 #!/sbin/openrc-run
 # SPDX-License-Identifier: GPL-3.0-or-later
 
-# The user netdata is configured to run as.
-# If you edit its configuration file to set a different
-# user, set it here too, to have its files switch ownership
-: "${NETDATA_OWNER:=@netdata_user_POST@:@netdata_user_POST@}"
+NETDATA_OWNER="@netdata_user_POST@:@netdata_user_POST@"
+NETDATA_PIDFILE="@localstatedir_POST@/run/netdata/netdata.pid"
 
-# The timeout in seconds to wait for netdata
-# to save its database on disk and exit.
-: "${NETDATA_WAIT_EXIT_TIMEOUT:=60}"
-
-# When set to 1, if netdata does not exit in
-# NETDATA_WAIT_EXIT_TIMEOUT, we will force it
-# to exit.
-: "${NETDATA_FORCE_EXIT:=0}"
-
-# When set to 1, we use netdatacli for reload/rotate/save commands instead of s-s-d.
-: "${NETDATA_USE_NETDATACLI:=0}"
-
-# Specifies the pidfile to use when running in the background.
-: "${NETDATA_PIDFILE:=@localstatedir_POST@/run/netdata/netdata.pid}"
+description="Run the Netdata system monitoring agent."
 
 extra_started_commands="reload rotate save"
+description_reload="Reload health configuration."
+description_rotate="Reopen log files."
+description_save="Force sync of database to disk."
+
 command_prefix="@sbindir_POST@"
 command="${command_prefix}/netdata"
 command_args="-P ${NETDATA_PIDFILE} ${NETDATA_EXTRA_ARGS}"
 command_args_foreground="-D"
 start_stop_daemon_args="-u ${NETDATA_OWNER}"
-if [ "${NETDATA_FORCE_EXIT}" -eq 1 ]; then
-    retry="TERM/${NETDATA_WAIT_EXIT_TIMEOUT}/KILL/1"
-else
-    retry="TERM/${NETDATA_WAIT_EXIT_TIMEOUT}"
-fi
 
 depend() {
     use logger
@@ -47,6 +31,14 @@ start_pre() {
     fi
 }
 
+stop_pre() {
+    if [ "0${NETDATA_FORCE_EXIT}" -eq 1 ]; then
+        retry="TERM/${NETDATA_WAIT_EXIT_TIMEOUT:-60}/KILL/1"
+    else
+        retry="TERM/${NETDATA_WAIT_EXIT_TIMEOUT:-60}"
+    fi
+}
+
 run_cmd() {
     cmd="${1}"
     msg="${2}"
diff --git a/system/runit/run.in b/system/runit/run.in
new file mode 100644
index 000000000..4ea783cc6
--- /dev/null
+++ b/system/runit/run.in
@@ -0,0 +1,16 @@
+#!/bin/sh
+
+piddir="@localstatedir_POST@/run/netdata/netdata.pid"
+pidfile="${piddir}/netdata.pid"
+
+cachedir="@localstatedir_POST@/cache/netdata"
+
+command="@sbindir_POST@/netdata"
+command_args="-P ${pidfile} -D"
+
+[ ! -d "${piddir}" ] && mkdir -p "${piddir}"
+[ ! -d "${cachedir}" ] && mkdir -p "${cachedir}"
+chown -R @netdata_user_POST@ "${piddir}"
+chown -R @netdata_user_POST@ "${cachedir}"
+
+exec ${command} ${command_args}
diff --git a/system/systemd/50-netdata.preset b/system/systemd/50-netdata.preset
new file mode 100644
index 000000000..fe4e5a197
--- /dev/null
+++ b/system/systemd/50-netdata.preset
@@ -0,0 +1 @@
+enable netdata.service
diff --git a/system/netdata-updater.service.in b/system/systemd/netdata-updater.service.in
index d0bd4994c..d0bd4994c 100644
--- a/system/netdata-updater.service.in
+++ b/system/systemd/netdata-updater.service.in
diff --git a/system/netdata-updater.timer b/system/systemd/netdata-updater.timer
index 8b36e46ff..8b36e46ff 100644
--- a/system/netdata-updater.timer
+++ b/system/systemd/netdata-updater.timer
diff --git a/system/netdata.service.in b/system/systemd/netdata.service.in
index 25d95b2b8..25d95b2b8 100644
--- a/system/netdata.service.in
+++ b/system/systemd/netdata.service.in
diff --git a/system/netdata.service.v235.in b/system/systemd/netdata.service.v235.in
index e3232056f..e3232056f 100644
--- a/system/netdata.service.v235.in
+++ b/system/systemd/netdata.service.v235.in
diff --git a/system/vnodes/vnodes.conf b/system/vnodes/vnodes.conf
new file mode 100644
index 000000000..abcd57842
--- /dev/null
+++ b/system/vnodes/vnodes.conf
@@ -0,0 +1,23 @@
+## This file is in YAML format.
+##
+## It contains a list of virtual nodes. Virtual node, defined with the following parameters:
+##
+##  1. hostname
+##     The hostname of the virtual node. String. Required.
+##  2. guid
+##     Uniquely identifies the node. String. Required.
+##  3. labels
+##     The virtual node host labels. Dictionary in the form key: value. Optional.
+##     Special labels that are used to set virtual host system information:
+##     https://learn.netdata.cloud/docs/improving-netdata---developers/external-plugins#host_label
+##
+## You can create GUIDs online: https://www.guidgen.com/
+## or generate with the linux command: uuidgen
+##
+## ---------------------------------------------------------------------------------------------------------------------
+
+#- hostname: HOSTNAME1
+#  guid: GUID1
+#
+#- hostname: HOSTNAME2
+#  guid: GUID2