Page duty V2 (#10189)

Add Pagerduty V2 to Netdata.

3 files changed, 1298 insertions, 1243 deletions

diff --git a/health/notifications/alarm-notify.sh.in b/health/notifications/alarm-notify.sh.in
index 8da0148335..d12ea6ad90 100755
--- a/health/notifications/alarm-notify.sh.in
+++ b/health/notifications/alarm-notify.sh.in
@@ -43,35 +43,35 @@
 # testing notifications
 
 if { [ "${1}" = "test" ] || [ "${2}" = "test" ]; } && [ "${#}" -le 2 ]; then
-	if [ "${2}" = "test" ]; then
-		recipient="${1}"
-	else
-		recipient="${2}"
-	fi
-
-	[ -z "${recipient}" ] && recipient="sysadmin"
-
-	id=1
-	last="CLEAR"
-	test_res=0
-	for x in "WARNING" "CRITICAL" "CLEAR"; do
-		echo >&2
-		echo >&2 "# SENDING TEST ${x} ALARM TO ROLE: ${recipient}"
-
-		"${0}" "${recipient}" "$(hostname)" 1 1 "${id}" "$(date +%s)" "test_alarm" "test.chart" "test.family" "${x}" "${last}" 100 90 "${0}" 1 $((0 + id)) "units" "this is a test alarm to verify notifications work" "new value" "old value" "evaluated expression" "expression variable values" 0 0
-		#shellcheck disable=SC2181
-		if [ $? -ne 0 ]; then
-			echo >&2 "# FAILED"
-			test_res=1
-		else
-			echo >&2 "# OK"
-		fi
-
-		last="${x}"
-		id=$((id + 1))
-	done
-
-	exit $test_res
+  if [ "${2}" = "test" ]; then
+    recipient="${1}"
+  else
+    recipient="${2}"
+  fi
+
+  [ -z "${recipient}" ] && recipient="sysadmin"
+
+  id=1
+  last="CLEAR"
+  test_res=0
+  for x in "WARNING" "CRITICAL" "CLEAR"; do
+    echo >&2
+    echo >&2 "# SENDING TEST ${x} ALARM TO ROLE: ${recipient}"
+
+    "${0}" "${recipient}" "$(hostname)" 1 1 "${id}" "$(date +%s)" "test_alarm" "test.chart" "test.family" "${x}" "${last}" 100 90 "${0}" 1 $((0 + id)) "units" "this is a test alarm to verify notifications work" "new value" "old value" "evaluated expression" "expression variable values" 0 0
+    #shellcheck disable=SC2181
+    if [ $? -ne 0 ]; then
+      echo >&2 "# FAILED"
+      test_res=1
+    else
+      echo >&2 "# OK"
+    fi
+
+    last="${x}"
+    id=$((id + 1))
+  done
+
+  exit $test_res
 fi
 
 export PATH="${PATH}:/sbin:/usr/sbin:/usr/local/sbin"
@@ -82,67 +82,67 @@ export LC_ALL=C
 PROGRAM_NAME="$(basename "${0}")"
 
 logdate() {
-	date "+%Y-%m-%d %H:%M:%S"
+  date "+%Y-%m-%d %H:%M:%S"
 }
 
 log() {
-	local status="${1}"
-	shift
+  local status="${1}"
+  shift
 
-	echo >&2 "$(logdate): ${PROGRAM_NAME}: ${status}: ${*}"
+  echo >&2 "$(logdate): ${PROGRAM_NAME}: ${status}: ${*}"
 
 }
 
 warning() {
-	log WARNING "${@}"
+  log WARNING "${@}"
 }
 
 error() {
-	log ERROR "${@}"
+  log ERROR "${@}"
 }
 
 info() {
-	log INFO "${@}"
+  log INFO "${@}"
 }
 
 fatal() {
-	log FATAL "${@}"
-	exit 1
+  log FATAL "${@}"
+  exit 1
 }
 
 debug=${NETDATA_ALARM_NOTIFY_DEBUG-0}
 debug() {
-	[ "${debug}" = "1" ] && log DEBUG "${@}"
+  [ "${debug}" = "1" ] && log DEBUG "${@}"
 }
 
 docurl() {
-	if [ -z "${curl}" ]; then
-		error "${curl} is unset."
-		return 1
-	fi
-
-	if [ "${debug}" = "1" ]; then
-		echo >&2 "--- BEGIN curl command ---"
-		printf >&2 "%q " ${curl} "${@}"
-		echo >&2
-		echo >&2 "--- END curl command ---"
-
-		local out code ret
-		out=$(mktemp /tmp/netdata-health-alarm-notify-XXXXXXXX)
-		code=$(${curl} ${curl_options} --write-out "%{http_code}" --output "${out}" --silent --show-error "${@}")
-		ret=$?
-		echo >&2 "--- BEGIN received response ---"
-		cat >&2 "${out}"
-		echo >&2
-		echo >&2 "--- END received response ---"
-		echo >&2 "RECEIVED HTTP RESPONSE CODE: ${code}"
-		rm "${out}"
-		echo "${code}"
-		return ${ret}
-	fi
-
-	${curl} ${curl_options} --write-out "%{http_code}" --output /dev/null --silent --show-error "${@}"
-	return $?
+  if [ -z "${curl}" ]; then
+    error "${curl} is unset."
+    return 1
+  fi
+
+  if [ "${debug}" = "1" ]; then
+    echo >&2 "--- BEGIN curl command ---"
+    printf >&2 "%q " ${curl} "${@}"
+    echo >&2
+    echo >&2 "--- END curl command ---"
+
+    local out code ret
+    out=$(mktemp /tmp/netdata-health-alarm-notify-XXXXXXXX)
+    code=$(${curl} ${curl_options} --write-out "%{http_code}" --output "${out}" --silent --show-error "${@}")
+    ret=$?
+    echo >&2 "--- BEGIN received response ---"
+    cat >&2 "${out}"
+    echo >&2
+    echo >&2 "--- END received response ---"
+    echo >&2 "RECEIVED HTTP RESPONSE CODE: ${code}"
+    rm "${out}"
+    echo "${code}"
+    return ${ret}
+  fi
+
+  ${curl} ${curl_options} --write-out "%{http_code}" --output /dev/null --silent --show-error "${@}"
+  return $?
 }
 
 # -----------------------------------------------------------------------------
@@ -181,14 +181,14 @@ matrix
 # this is to be overwritten by the config file
 
 custom_sender() {
-	info "not sending custom notification for ${status} of '${host}.${chart}.${name}'"
+  info "not sending custom notification for ${status} of '${host}.${chart}.${name}'"
 }
 
 # -----------------------------------------------------------------------------
 
 # check for BASH v4+ (required for associative arrays)
 if [ ${BASH_VERSINFO[0]} -lt 4 ]; then
-	fatal "BASH version 4 or later is required (this is ${BASH_VERSION})."
+  fatal "BASH version 4 or later is required (this is ${BASH_VERSION})."
 fi
 
 # -----------------------------------------------------------------------------
@@ -204,49 +204,49 @@ fi
 # parse command line parameters
 
 if [[ ${1} = "unittest" ]]; then
-	unittest=1        # enable unit testing mode
-	roles="${2}"      # the role that should be used for unit testing
-	cfgfile="${3}"    # the location of the config file to use for unit testing
-	status="${4}"     # the current status : REMOVED, UNINITIALIZED, UNDEFINED, CLEAR, WARNING, CRITICAL
-	old_status="${5}" # the previous status: REMOVED, UNINITIALIZED, UNDEFINED, CLEAR, WARNING, CRITICAL
+  unittest=1        # enable unit testing mode
+  roles="${2}"      # the role that should be used for unit testing
+  cfgfile="${3}"    # the location of the config file to use for unit testing
+  status="${4}"     # the current status : REMOVED, UNINITIALIZED, UNDEFINED, CLEAR, WARNING, CRITICAL
+  old_status="${5}" # the previous status: REMOVED, UNINITIALIZED, UNDEFINED, CLEAR, WARNING, CRITICAL
 else
-	roles="${1}"               # the roles that should be notified for this event
-	args_host="${2}"           # the host generated this event
-	unique_id="${3}"           # the unique id of this event
-	alarm_id="${4}"            # the unique id of the alarm that generated this event
-	event_id="${5}"            # the incremental id of the event, for this alarm id
-	when="${6}"                # the timestamp this event occurred
-	name="${7}"                # the name of the alarm, as given in netdata health.d entries
-	chart="${8}"               # the name of the chart (type.id)
-	family="${9}"              # the family of the chart
-	status="${10}"             # the current status : REMOVED, UNINITIALIZED, UNDEFINED, CLEAR, WARNING, CRITICAL
-	old_status="${11}"         # the previous status: REMOVED, UNINITIALIZED, UNDEFINED, CLEAR, WARNING, CRITICAL
-	value="${12}"              # the current value of the alarm
-	old_value="${13}"          # the previous value of the alarm
-	src="${14}"                # the line number and file the alarm has been configured
-	duration="${15}"           # the duration in seconds of the previous alarm state
-	non_clear_duration="${16}" # the total duration in seconds this is/was non-clear
-	units="${17}"              # the units of the value
-	info="${18}"               # a short description of the alarm
-	value_string="${19}"       # friendly value (with units)
-	# shellcheck disable=SC2034
-	# variable is unused, but https://github.com/netdata/netdata/pull/5164#discussion_r255572947
-	old_value_string="${20}"   # friendly old value (with units), previously named "old_value_string"
-	calc_expression="${21}"    # contains the expression that was evaluated to trigger the alarm
-	calc_param_values="${22}"  # the values of the parameters in the expression, at the time of the evaluation
-	total_warnings="${23}"     # Total number of alarms in WARNING state
-	total_critical="${24}"     # Total number of alarms in CRITICAL state
+  roles="${1}"               # the roles that should be notified for this event
+  args_host="${2}"           # the host generated this event
+  unique_id="${3}"           # the unique id of this event
+  alarm_id="${4}"            # the unique id of the alarm that generated this event
+  event_id="${5}"            # the incremental id of the event, for this alarm id
+  when="${6}"                # the timestamp this event occurred
+  name="${7}"                # the name of the alarm, as given in netdata health.d entries
+  chart="${8}"               # the name of the chart (type.id)
+  family="${9}"              # the family of the chart
+  status="${10}"             # the current status : REMOVED, UNINITIALIZED, UNDEFINED, CLEAR, WARNING, CRITICAL
+  old_status="${11}"         # the previous status: REMOVED, UNINITIALIZED, UNDEFINED, CLEAR, WARNING, CRITICAL
+  value="${12}"              # the current value of the alarm
+  old_value="${13}"          # the previous value of the alarm
+  src="${14}"                # the line number and file the alarm has been configured
+  duration="${15}"           # the duration in seconds of the previous alarm state
+  non_clear_duration="${16}" # the total duration in seconds this is/was non-clear
+  units="${17}"              # the units of the value
+  info="${18}"               # a short description of the alarm
+  value_string="${19}"       # friendly value (with units)
+  # shellcheck disable=SC2034
+  # variable is unused, but https://github.com/netdata/netdata/pull/5164#discussion_r255572947
+  old_value_string="${20}"   # friendly old value (with units), previously named "old_value_string"
+  calc_expression="${21}"    # contains the expression that was evaluated to trigger the alarm
+  calc_param_values="${22}"  # the values of the parameters in the expression, at the time of the evaluation
+  total_warnings="${23}"     # Total number of alarms in WARNING state
+  total_critical="${24}"     # Total number of alarms in CRITICAL state
 fi
 
 # -----------------------------------------------------------------------------
 # find a suitable hostname to use, if netdata did not supply a hostname
 
 if [ -z ${args_host} ]; then
-	this_host=$(hostname -s 2>/dev/null)
-	host="${this_host}"
-	args_host="${this_host}"
+  this_host=$(hostname -s 2>/dev/null)
+  host="${this_host}"
+  args_host="${this_host}"
 else
-	host="${args_host}"
+  host="${args_host}"
 fi
 
 # -----------------------------------------------------------------------------
@@ -254,14 +254,14 @@ fi
 
 # don't do anything if this is not WARNING, CRITICAL or CLEAR
 if [ "${status}" != "WARNING" ] && [ "${status}" != "CRITICAL" ] && [ "${status}" != "CLEAR" ]; then
-	info "not sending notification for ${status} of '${host}.${chart}.${name}'"
-	exit 1
+  info "not sending notification for ${status} of '${host}.${chart}.${name}'"
+  exit 1
 fi
 
 # don't do anything if this is CLEAR, but it was not WARNING or CRITICAL
 if [ "${clear_alarm_always}" != "YES" ] && [ "${old_status}" != "WARNING" ] && [ "${old_status}" != "CRITICAL" ] && [ "${status}" = "CLEAR" ]; then
-	info "not sending notification for ${status} of '${host}.${chart}.${name}' (last status was ${old_status})"
-	exit 1
+  info "not sending notification for ${status} of '${host}.${chart}.${name}' (last status was ${old_status})"
+  exit 1
 fi
 
 # -----------------------------------------------------------------------------
@@ -286,12 +286,12 @@ sendmail=
 
 # enable / disable features
 for method_name in ${method_names^^}; do
-	declare SEND_${method_name}="YES"
-	declare DEFAULT_RECIPIENT_${method_name}
+  declare SEND_${method_name}="YES"
+  declare DEFAULT_RECIPIENT_${method_name}
 done
 
 for method_name in ${method_names}; do
-	declare -A role_recipients_${method_name}
+  declare -A role_recipients_${method_name}
 done
 
 # slack configs
@@ -347,6 +347,7 @@ KAFKA_SENDER_IP=
 
 # pagerduty.com configs
 PD_SERVICE_KEY=
+USE_PD_VERSION=
 
 # fleep.io configs
 FLEEP_SENDER="${host}"
@@ -395,87 +396,87 @@ OPSGENIE_API_KEY=
 # these will overwrite the variables above
 
 if [ ${unittest} ]; then
-	if source "${cfgfile}"; then
-		error "Failed to load requested config file."
-		exit 1
-	fi
+  if source "${cfgfile}"; then
+    error "Failed to load requested config file."
+    exit 1
+  fi
 else
-	for CONFIG in "${NETDATA_STOCK_CONFIG_DIR}/health_alarm_notify.conf" "${NETDATA_USER_CONFIG_DIR}/health_alarm_notify.conf"; do
-		if [ -f "${CONFIG}" ]; then
-			debug "Loading config file '${CONFIG}'..."
-			source "${CONFIG}" || error "Failed to load config file '${CONFIG}'."
-		else
-			warning "Cannot find file '${CONFIG}'."
-		fi
-	done
+  for CONFIG in "${NETDATA_STOCK_CONFIG_DIR}/health_alarm_notify.conf" "${NETDATA_USER_CONFIG_DIR}/health_alarm_notify.conf"; do
+    if [ -f "${CONFIG}" ]; then
+      debug "Loading config file '${CONFIG}'..."
+      source "${CONFIG}" || error "Failed to load config file '${CONFIG}'."
+    else
+      warning "Cannot find file '${CONFIG}'."
+    fi
+  done
 fi
 
 # If we didn't autodetect the character set for e-mail and it wasn't
 # set by the user, we need to set it to a reasonable default.  UTF-8
 # should be correct for almost all modern UNIX systems.
 if [ -z ${EMAIL_CHARSET} ]; then
-	EMAIL_CHARSET="UTF-8"
+  EMAIL_CHARSET="UTF-8"
 fi
 
 # If we've been asked to use FQDN's for the URL's in the alarm, do so,
 # unless we're sending an alarm for a child system which we can't get the
 # FQDN of easily.
 if [ "${use_fqdn}" = "YES" ] && [ "${host}" = "$(hostname -s 2>/dev/null)" ]; then
-	host="$(hostname -f 2>/dev/null)"
+  host="$(hostname -f 2>/dev/null)"
 fi
 
 # -----------------------------------------------------------------------------
 # filter a recipient based on alarm event severity
 
 filter_recipient_by_criticality() {
-	local method="${1}" x="${2}" r s
-	shift
-
-	r="${x/|*/}" # the recipient
-	s="${x/*|/}" # the severity required for notifying this recipient
-
-	# no severity filtering for this person
-	[ "${r}" = "${s}" ] && return 0
-
-	# the severity is invalid
-	s="${s^^}"
-	if [ "${s}" != "CRITICAL" ]; then
-		error "SEVERITY FILTERING for ${x} VIA ${method}: invalid severity '${s,,}', only 'critical' is supported."
-		return 0
-	fi
-
-	# create the status tracking directory for this user
-	[ ! -d "${NETDATA_CACHE_DIR}/alarm-notify/${method}/${r}" ] &&
-		mkdir -p "${NETDATA_CACHE_DIR}/alarm-notify/${method}/${r}"
-
-	case "${status}" in
-	CRITICAL)
-		# make sure he will get future notifications for this alarm too
-		touch "${NETDATA_CACHE_DIR}/alarm-notify/${method}/${r}/${alarm_id}"
-		debug "SEVERITY FILTERING for ${x} VIA ${method}: ALLOW: the alarm is CRITICAL (will now receive next status change)"
-		return 0
-		;;
-
-	WARNING)
-		if [ -f "${NETDATA_CACHE_DIR}/alarm-notify/${method}/${r}/${alarm_id}" ]; then
-			# we do not remove the file, so that he will get future notifications of this alarm
-			debug "SEVERITY FILTERING for ${x} VIA ${method}: ALLOW: recipient has been notified for this alarm in the past (will still receive next status change)"
-			return 0
-		fi
-		;;
-
-	*)
-		if [ -f "${NETDATA_CACHE_DIR}/alarm-notify/${method}/${r}/${alarm_id}" ]; then
-			# remove the file, so that he will only receive notifications for CRITICAL states for this alarm
-			rm "${NETDATA_CACHE_DIR}/alarm-notify/${method}/${r}/${alarm_id}"
-			debug "SEVERITY FILTERING for ${x} VIA ${method}: ALLOW: recipient has been notified for this alarm (will only receive CRITICAL notifications from now on)"
-			return 0
-		fi
-		;;
-	esac
-
-	debug "SEVERITY FILTERING for ${x} VIA ${method}: BLOCK: recipient should not receive this notification"
-	return 1
+  local method="${1}" x="${2}" r s
+  shift
+
+  r="${x/|*/}" # the recipient
+  s="${x/*|/}" # the severity required for notifying this recipient
+
+  # no severity filtering for this person
+  [ "${r}" = "${s}" ] && return 0
+
+  # the severity is invalid
+  s="${s^^}"
+  if [ "${s}" != "CRITICAL" ]; then
+    error "SEVERITY FILTERING for ${x} VIA ${method}: invalid severity '${s,,}', only 'critical' is supported."
+    return 0
+  fi
+
+  # create the status tracking directory for this user
+  [ ! -d "${NETDATA_CACHE_DIR}/alarm-notify/${method}/${r}" ] &&
+    mkdir -p "${NETDATA_CACHE_DIR}/alarm-notify/${method}/${r}"
+
+  case "${status}" in
+  CRITICAL)
+    # make sure he will get future notifications for this alarm too
+    touch "${NETDATA_CACHE_DIR}/alarm-notify/${method}/${r}/${alarm_id}"
+    debug "SEVERITY FILTERING for ${x} VIA ${method}: ALLOW: the alarm is CRITICAL (will now receive next status change)"
+    return 0
+    ;;
+
+  WARNING)
+    if [ -f "${NETDATA_CACHE_DIR}/alarm-notify/${method}/${r}/${alarm_id}" ]; then
+      # we do not remove the file, so that he will get future notifications of this alarm
+      debug "SEVERITY FILTERING for ${x} VIA ${method}: ALLOW: recipient has been notified for this alarm in the past (will still receive next status change)"
+      return 0
+    fi
+    ;;
+
+  *)
+    if [ -f "${NETDATA_CACHE_DIR}/alarm-notify/${method}/${r}/${alarm_id}" ]; then
+      # remove the file, so that he will only receive notifications for CRITICAL states for this alarm
+      rm "${NETDATA_CACHE_DIR}/alarm-notify/${method}/${r}/${alarm_id}"
+      debug "SEVERITY FILTERING for ${x} VIA ${method}: ALLOW: recipient has been notified for this alarm (will only receive CRITICAL notifications from now on)"
+      return 0
+    fi
+    ;;
+  esac
+
+  debug "SEVERITY FILTERING for ${x} VIA ${method}: BLOCK: recipient should not receive this notification"
+  return 1
 }
 
 # -----------------------------------------------------------------------------
@@ -547,93 +548,93 @@ filter_recipient_by_criticality() {
 [ -z "${STACKPULSE_WEBHOOK}" ] && SEND_STACKPULSE="NO"
 
 if [ "${SEND_PUSHOVER}" = "YES" ] ||
-	[ "${SEND_SLACK}" = "YES" ] ||
-	[ "${SEND_ROCKETCHAT}" = "YES" ] ||
-	[ "${SEND_ALERTA}" = "YES" ] ||
-	[ "${SEND_PD}" = "YES" ] ||
-	[ "${SEND_FLOCK}" = "YES" ] ||
-	[ "${SEND_DISCORD}" = "YES" ] ||
-	[ "${SEND_HIPCHAT}" = "YES" ] ||
-	[ "${SEND_TWILIO}" = "YES" ] ||
-	[ "${SEND_MESSAGEBIRD}" = "YES" ] ||
-	[ "${SEND_KAVENEGAR}" = "YES" ] ||
-	[ "${SEND_TELEGRAM}" = "YES" ] ||
-	[ "${SEND_PUSHBULLET}" = "YES" ] ||
-	[ "${SEND_KAFKA}" = "YES" ] ||
-	[ "${SEND_FLEEP}" = "YES" ] ||
-	[ "${SEND_PROWL}" = "YES" ] ||
-	[ "${SEND_HANGOUTS}" = "YES" ] ||
-	[ "${SEND_MATRIX}" = "YES" ] ||
-	[ "${SEND_CUSTOM}" = "YES" ] ||
-	[ "${SEND_MSTEAM}" = "YES" ] ||
-	[ "${SEND_DYNATRACE}" = "YES" ] ||
-	[ "${SEND_STACKPULSE}" = "YES" ] ||
-	[ "${SEND_OPSGENIE}" = "YES" ]; then
-	# if we need curl, check for the curl command
-	if [ -z "${curl}" ]; then
-		curl="$(command -v curl 2>/dev/null)"
-	fi
-	if [ -z "${curl}" ]; then
-		error "Cannot find curl command in the system path. Disabling all curl based notifications."
-		SEND_PUSHOVER="NO"
-		SEND_PUSHBULLET="NO"
-		SEND_TELEGRAM="NO"
-		SEND_SLACK="NO"
-		SEND_MSTEAM="NO"
-		SEND_ROCKETCHAT="NO"
-		SEND_ALERTA="NO"
-		SEND_PD="NO"
-		SEND_FLOCK="NO"
-		SEND_DISCORD="NO"
-		SEND_TWILIO="NO"
-		SEND_HIPCHAT="NO"
-		SEND_MESSAGEBIRD="NO"
-		SEND_KAVENEGAR="NO"
-		SEND_KAFKA="NO"
-		SEND_FLEEP="NO"
-		SEND_PROWL="NO"
-		SEND_HANGOUTS="NO"
-		SEND_MATRIX="NO"
-		SEND_CUSTOM="NO"
-		SEND_DYNATRACE="NO"
-		SEND_STACKPULSE="NO"
-		SEND_OPSGENIE="NO"
-	fi
+  [ "${SEND_SLACK}" = "YES" ] ||
+  [ "${SEND_ROCKETCHAT}" = "YES" ] ||
+  [ "${SEND_ALERTA}" = "YES" ] ||
+  [ "${SEND_PD}" = "YES" ] ||
+  [ "${SEND_FLOCK}" = "YES" ] ||
+  [ "${SEND_DISCORD}" = "YES" ] ||
+  [ "${SEND_HIPCHAT}" = "YES" ] ||
+  [ "${SEND_TWILIO}" = "YES" ] ||
+  [ "${SEND_MESSAGEBIRD}" = "YES" ] ||
+  [ "${SEND_KAVENEGAR}" = "YES" ] ||
+  [ "${SEND_TELEGRAM}" = "YES" ] ||
+  [ "${SEND_PUSHBULLET}" = "YES" ] ||
+  [ "${SEND_KAFKA}" = "YES" ] ||
+  [ "${SEND_FLEEP}" = "YES" ] ||
+  [ "${SEND_PROWL}" = "YES" ] ||
+  [ "${SEND_HANGOUTS}" = "YES" ] ||
+  [ "${SEND_MATRIX}" = "YES" ] ||
+  [ "${SEND_CUSTOM}" = "YES" ] ||
+  [ "${SEND_MSTEAM}" = "YES" ] ||
+  [ "${SEND_DYNATRACE}" = "YES" ] ||
+  [ "${SEND_STACKPULSE}" = "YES" ] ||
+  [ "${SEND_OPSGENIE}" = "YES" ]; then
+  # if we need curl, check for the curl command
+  if [ -z "${curl}" ]; then
+    curl="$(command -v curl 2>/dev/null)"
+  fi
+  if [ -z "${curl}" ]; then
+    error "Cannot find curl command in the system path. Disabling all curl based notifications."
+    SEND_PUSHOVER="NO"
+    SEND_PUSHBULLET="NO"
+    SEND_TELEGRAM="NO"
+    SEND_SLACK="NO"
+    SEND_MSTEAM="NO"
+    SEND_ROCKETCHAT="NO"
+    SEND_ALERTA="NO"
+    SEND_PD="NO"
+    SEND_FLOCK="NO"
+    SEND_DISCORD="NO"
+    SEND_TWILIO="NO"
+    SEND_HIPCHAT="NO"
+    SEND_MESSAGEBIRD="NO"
+    SEND_KAVENEGAR="NO"
+    SEND_KAFKA="NO"
+    SEND_FLEEP="NO"
+    SEND_PROWL="NO"
+    SEND_HANGOUTS="NO"
+    SEND_MATRIX="NO"
+    SEND_CUSTOM="NO"
+    SEND_DYNATRACE="NO"
+    SEND_STACKPULSE="NO"
+    SEND_OPSGENIE="NO"
+  fi
 fi
 
 if [ "${SEND_SMS}" = "YES" ]; then
-	if [ -z "${sendsms}" ]; then
-		sendsms="$(command -v sendsms 2>/dev/null)"
-	fi
-	if [ -z "${sendsms}" ]; then
-		SEND_SMS="NO"
-	fi
+  if [ -z "${sendsms}" ]; then
+    sendsms="$(command -v sendsms 2>/dev/null)"
+  fi
+  if [ -z "${sendsms}" ]; then
+    SEND_SMS="NO"
+  fi
 fi
 # if we need sendmail, check for the sendmail command
 if [ "${SEND_EMAIL}" = "YES" ] && [ -z "${sendmail}" ]; then
-	sendmail="$(command -v sendmail 2>/dev/null)"
-	if [ -z "${sendmail}" ]; then
-		debug "Cannot find sendmail command in the system path. Disabling email notifications."
-		SEND_EMAIL="NO"
-	fi
+  sendmail="$(command -v sendmail 2>/dev/null)"
+  if [ -z "${sendmail}" ]; then
+    debug "Cannot find sendmail command in the system path. Disabling email notifications."
+    SEND_EMAIL="NO"
+  fi
 fi
 
 # if we need logger, check for the logger command
 if [ "${SEND_SYSLOG}" = "YES" ] && [ -z "${logger}" ]; then
-	logger="$(command -v logger 2>/dev/null)"
-	if [ -z "${logger}" ]; then
-		debug "Cannot find logger command in the system path. Disabling syslog notifications."
-		SEND_SYSLOG="NO"
-	fi
+  logger="$(command -v logger 2>/dev/null)"
+  if [ -z "${logger}" ]; then
+    debug "Cannot find logger command in the system path. Disabling syslog notifications."
+    SEND_SYSLOG="NO"
+  fi
 fi
 
 # if we need aws, check for the aws command
 if [ "${SEND_AWSSNS}" = "YES" ] && [ -z "${aws}" ]; then
-	aws="$(command -v aws 2>/dev/null)"
-	if [ -z "${aws}" ]; then
-		debug "Cannot find aws command in the system path.  Disabling Amazon SNS notifications."
-		SEND_AWSSNS="NO"
-	fi
+  aws="$(command -v aws 2>/dev/null)"
+  if [ -z "${aws}" ]; then
+    debug "Cannot find aws command in the system path.  Disabling Amazon SNS notifications."
+    SEND_AWSSNS="NO"
+  fi
 fi
 
 # -----------------------------------------------------------------------------
@@ -642,47 +643,47 @@ fi
 # netdata may call us with multiple roles, and roles may have multiple but
 # overlapping recipients - so, here we find the unique recipients.
 for method_name in ${method_names}; do
-	send_var="SEND_${method_name^^}"
-	if [ "${!send_var}" = "NO" ]; then
-		continue
-	fi
-
-	declare -A arr_var=()
-
-	for x in ${roles//,/ }; do
-		# the roles 'silent' and 'disabled' mean:
-		# don't send a notification for this role
-		if [ "${x}" = "silent" ] || [ "${x}" = "disabled" ]; then
-			continue
-		fi
-
-		role_recipients="role_recipients_${method_name}[$x]"
-		default_recipient_var="DEFAULT_RECIPIENT_${method_name^^}"
-
-		a="${!role_recipients}"
-		[ -z "${a}" ] && a="${!default_recipient_var}"
-		for r in ${a//,/ }; do
-			[ "${r}" != "disabled" ] && filter_recipient_by_criticality ${method_name} "${r}" && arr_var[${r/|*/}]="1"
-		done
-	done
-
-	# build the list of recipients
-	to_var="to_${method_name}"
-	declare to_${method_name}="${!arr_var[*]}"
-
-	[ -z "${!to_var}" ] && declare ${send_var}="NO"
+  send_var="SEND_${method_name^^}"
+  if [ "${!send_var}" = "NO" ]; then
+    continue
+  fi
+
+  declare -A arr_var=()
+
+  for x in ${roles//,/ }; do
+    # the roles 'silent' and 'disabled' mean:
+    # don't send a notification for this role
+    if [ "${x}" = "silent" ] || [ "${x}" = "disabled" ]; then
+      continue
+    fi
+
+    role_recipients="role_recipients_${method_name}[$x]"
+    default_recipient_var="DEFAULT_RECIPIENT_${method_name^^}"
+
+    a="${!role_recipients}"
+    [ -z "${a}" ] && a="${!default_recipient_var}"
+    for r in ${a//,/ }; do
+      [ "${r}" != "disabled" ] && filter_recipient_by_criticality ${method_name} "${r}" && arr_var[${r/|*/}]="1"
+    done
+  done
+
+  # build the list of recipients
+  to_var="to_${method_name}"
+  declare to_${method_name}="${!arr_var[*]}"
+
+  [ -z "${!to_var}" ] && declare ${send_var}="NO"
 done
 
 # -----------------------------------------------------------------------------
 # handle fixup of the email recipient list.
 
 fix_to_email() {
-	to_email=
-	while [ -n "${1}" ]; do
-		[ -n "${to_email}" ] && to_email="${to_email}, "
-		to_email="${to_email}${1}"
-		shift 1
-	done
+  to_email=
+  while [ -n "${1}" ]; do
+    [ -n "${to_email}" ] && to_email="${to_email}, "
+    to_email="${to_email}${1}"
+    shift 1
+  done
 }
 
 # ${to_email} without quotes here
@@ -691,52 +692,52 @@ fix_to_email ${to_email}
 # -----------------------------------------------------------------------------
 # handle output if we're running in unit test mode
 if [ ${unittest} ]; then
-	for method_name in ${method_names}; do
-		to_var="to_${method_name}"
-		echo "results: ${method_name}: ${!to_var}"
-	done
-	exit 0
+  for method_name in ${method_names}; do
+    to_var="to_${method_name}"
+    echo "results: ${method_name}: ${!to_var}"
+  done
+  exit 0
 fi
 
 # -----------------------------------------------------------------------------
 # check that we have at least a method enabled
 proceed=0
 for method in "${SEND_EMAIL}" \
-	"${SEND_PUSHOVER}" \
-	"${SEND_TELEGRAM}" \
-	"${SEND_SLACK}" \
-	"${SEND_ROCKETCHAT}" \
-	"${SEND_ALERTA}" \
-	"${SEND_FLOCK}" \
-	"${SEND_DISCORD}" \
-	"${SEND_TWILIO}" \
-	"${SEND_HIPCHAT}" \
-	"${SEND_MESSAGEBIRD}" \
-	"${SEND_KAVENEGAR}" \
-	"${SEND_PUSHBULLET}" \
-	"${SEND_KAFKA}" \
-	"${SEND_PD}" \
-	"${SEND_FLEEP}" \
-	"${SEND_PROWL}" \
-	"${SEND_MATRIX}" \
-	"${SEND_CUSTOM}" \
-	"${SEND_IRC}" \
-	"${SEND_HANGOUTS}" \
-	"${SEND_AWSSNS}" \
-	"${SEND_SYSLOG}" \
-	"${SEND_SMS}" \
-	"${SEND_MSTEAM}" \
-	"${SEND_DYNATRACE}" \
-	"${SEND_STACKPULSE}" \
-	"${SEND_OPSGENIE}" ; do
-
-	if [ "${method}" == "YES" ]; then
-		proceed=1
-		break
-	fi
+  "${SEND_PUSHOVER}" \
+  "${SEND_TELEGRAM}" \
+  "${SEND_SLACK}" \
+  "${SEND_ROCKETCHAT}" \
+  "${SEND_ALERTA}" \
+  "${SEND_FLOCK}" \
+  "${SEND_DISCORD}" \
+  "${SEND_TWILIO}" \
+  "${SEND_HIPCHAT}" \
+  "${SEND_MESSAGEBIRD}" \
+  "${SEND_KAVENEGAR}" \
+  "${SEND_PUSHBULLET}" \
+  "${SEND_KAFKA}" \
+  "${SEND_PD}" \
+  "${SEND_FLEEP}" \
+  "${SEND_PROWL}" \
+  "${SEND_MATRIX}" \
+  "${SEND_CUSTOM}" \
+  "${SEND_IRC}" \
+  "${SEND_HANGOUTS}" \
+  "${SEND_AWSSNS}" \
+  "${SEND_SYSLOG}" \
+  "${SEND_SMS}" \
+  "${SEND_MSTEAM}" \
+  "${SEND_DYNATRACE}" \
+  "${SEND_STACKPULSE}" \
+  "${SEND_OPSGENIE}" ; do
+
+  if [ "${method}" == "YES" ]; then
+    proceed=1
+    break
+  fi
 done
 if [ "$proceed" -eq 0 ]; then
-	fatal "All notification methods are disabled. Not sending notification for host '${host}', chart '${chart}' to '${roles}' for '${name}' = '${value}' for status '${status}'."
+  fatal "All notification methods are disabled. Not sending notification for host '${host}', chart '${chart}' to '${roles}' for '${name}' = '${value}' for status '${status}'."
 fi
 
 # -----------------------------------------------------------------------------
@@ -750,34 +751,34 @@ date=$(date --date=@${when} "${date_format}" 2>/dev/null)
 # ----------------------------------------------------------------------------
 # prepare some extra headers if we've been asked to thread e-mails
 if [ "${SEND_EMAIL}" == "YES" ] && [ "${EMAIL_THREADING}" != "NO" ]; then
-	email_thread_headers="In-Reply-To: <${chart}-${name}@${host}>\\r\\nReferences: <${chart}-${name}@${host}>"
+  email_thread_headers="In-Reply-To: <${chart}-${name}@${host}>\\r\\nReferences: <${chart}-${name}@${host}>"
 else
-	email_thread_headers=
+  email_thread_headers=
 fi
 
 # -----------------------------------------------------------------------------
 # function to URL encode a string
 
 urlencode() {
-	local string="${1}" strlen encoded pos c o
-
-	strlen=${#string}
-	for ((pos = 0; pos < strlen; pos++)); do
-		c=${string:pos:1}
-		case "${c}" in
-		[-_.~a-zA-Z0-9])
-			o="${c}"
-			;;
-
-		*)
-			printf -v o '%%%02x' "'${c}"
-			;;
-		esac
-		encoded+="${o}"
-	done
-
-	REPLY="${encoded}"
-	echo "${REPLY}"
+  local string="${1}" strlen encoded pos c o
+
+  strlen=${#string}
+  for ((pos = 0; pos < strlen; pos++)); do
+    c=${string:pos:1}
+    case "${c}" in
+    [-_.~a-zA-Z0-9])
+      o="${c}"
+      ;;
+
+    *)
+      printf -v o '%%%02x' "'${c}"
+      ;;
+    esac
+    encoded+="${o}"
+  done
+
+  REPLY="${encoded}"
+  echo "${REPLY}"
 }
 
 # -----------------------------------------------------------------------------
@@ -785,154 +786,154 @@ urlencode() {
 # using DAYS, MINUTES, SECONDS
 
 duration4human() {
-	local s="${1}" d=0 h=0 m=0 ds="day" hs="hour" ms="minute" ss="second" ret
-	d=$((s / 86400))
-	s=$((s - (d * 86400)))
-	h=$((s / 3600))
-	s=$((s - (h * 3600)))
-	m=$((s / 60))
-	s=$((s - (m * 60)))
-
-	if [ ${d} -gt 0 ]; then
-		[ ${m} -ge 30 ] && h=$((h + 1))
-		[ ${d} -gt 1 ] && ds="days"
-		[ ${h} -gt 1 ] && hs="hours"
-		if [ ${h} -gt 0 ]; then
-			ret="${d} ${ds} and ${h} ${hs}"
-		else
-			ret="${d} ${ds}"
-		fi
-	elif [ ${h} -gt 0 ]; then
-		[ ${s} -ge 30 ] && m=$((m + 1))
-		[ ${h} -gt 1 ] && hs="hours"
-		[ ${m} -gt 1 ] && ms="minutes"
-		if [ ${m} -gt 0 ]; then
-			ret="${h} ${hs} and ${m} ${ms}"
-		else
-			ret="${h} ${hs}"
-		fi
-	elif [ ${m} -gt 0 ]; then
-		[ ${m} -gt 1 ] && ms="minutes"
-		[ ${s} -gt 1 ] && ss="seconds"
-		if [ ${s} -gt 0 ]; then
-			ret="${m} ${ms} and ${s} ${ss}"
-		else
-			ret="${m} ${ms}"
-		fi
-	else
-		[ ${s} -gt 1 ] && ss="seconds"
-		ret="${s} ${ss}"
-	fi
-
-	REPLY="${ret}"
-	echo "${REPLY}"
+  local s="${1}" d=0 h=0 m=0 ds="day" hs="hour" ms="minute" ss="second" ret
+  d=$((s / 86400))
+  s=$((s - (d * 86400)))
+  h=$((s / 3600))
+  s=$((s - (h * 3600)))
+  m=$((s / 60))
+  s=$((s - (m * 60)))
+
+  if [ ${d} -gt 0 ]; then
+    [ ${m} -ge 30 ] && h=$((h + 1))
+    [ ${d} -gt 1 ] && ds="days"
+    [ ${h} -gt 1 ] && hs="hours"
+    if [ ${h} -gt 0 ]; then
+      ret="${d} ${ds} and ${h} ${hs}"
+    else
+      ret="${d} ${ds}"
+    fi
+  elif [ ${h} -gt 0 ]; then
+    [ ${s} -ge 30 ] && m=$((m + 1))
+    [ ${h} -gt 1 ] && hs="hours"
+    [ ${m} -gt 1 ] && ms="minutes"
+    if [ ${m} -gt 0 ]; then
+      ret="${h} ${hs} and ${m} ${ms}"
+    else
+      ret="${h} ${hs}"
+    fi
+  elif [ ${m} -gt 0 ]; then
+    [ ${m} -gt 1 ] && ms="minutes"
+    [ ${s} -gt 1 ] && ss="seconds"
+    if [ ${s} -gt 0 ]; then
+      ret="${m} ${ms} and ${s} ${ss}"
+    else
+      ret="${m} ${ms}"
+    fi
+  else
+    [ ${s} -gt 1 ] && ss="seconds"
+    ret="${s} ${ss}"
+  fi
+
+  REPLY="${ret}"
+  echo "${REPLY}"
 }
 
 # -----------------------------------------------------------------------------
 # email sender
 
 send_email() {
-	local ret opts=() sender_email="${EMAIL_SENDER}" sender_name=
-	if [ "${SEND_EMAIL}" = "YES" ]; then
-
-		if [ -n "${EMAIL_SENDER}" ]; then
-			if [[ ${EMAIL_SENDER} =~ ^\".*\"\ \<.*\>$ ]]; then
-				# the name includes double quotes
-				sender_email="$(echo "${EMAIL_SENDER}" | cut -d '<' -f 2 | cut -d '>' -f 1)"
-				sender_name="$(echo "${EMAIL_SENDER}" | cut -d '"' -f 2)"
-			elif [[ ${EMAIL_SENDER} =~ ^\'.*\'\ \<.*\>$ ]]; then
-				# the name includes single quotes
-				sender_email="$(echo "${EMAIL_SENDER}" | cut -d '<' -f 2 | cut -d '>' -f 1)"
-				sender_name="$(echo "${EMAIL_SENDER}" | cut -d "'" -f 2)"
-			elif [[ ${EMAIL_SENDER} =~ ^.*\ \<.*\>$ ]]; then
-				# the name does not have any quotes
-				sender_email="$(echo "${EMAIL_SENDER}" | cut -d '<' -f 2 | cut -d '>' -f 1)"
-				sender_name="$(echo "${EMAIL_SENDER}" | cut -d '<' -f 1)"
-			fi
-		fi
-
-		[ -n "${sender_email}" ] && opts+=(-f "${sender_email}")
-		[ -n "${sender_name}" ] && opts+=(-F "${sender_name}")
-
-		if [ "${debug}" = "1" ]; then
-			echo >&2 "--- BEGIN sendmail command ---"
-			printf >&2 "%q " "${sendmail}" -t "${opts[@]}"
-			echo >&2
-			echo >&2 "--- END sendmail command ---"
-		fi
-
-		"${sendmail}" -t "${opts[@]}"
-		ret=$?
-
-		if [ ${ret} -eq 0 ]; then
-			info "sent email notification for: ${host} ${c