dashboard: add instance variable

Instance alias variable can be used to select displayed cluster
instances for a dashboard. For InfluxDB dashboards, set of instances is
based on available in database label_pairs_alias values. For Prometheus
dashboards, set of instances is based on available in database alias
labels of tnt_uptime_info metric.

After this patch, each panel (except for Prometheus cluster aggregation
panels) include instance filters in queries.

After this patch, there are two different forms of static build
dashboards are available: with or without instance variable.

Closes #181

Author: DifferentialOrange

CHANGELOG.md

@@ -4,6 +4,12 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## Unreleased
+
+### Added
+- Variable to select displayed cluster instances
+
+
 ## [1.4.0] - 2022-08-03
 Grafana revisions: [InfluxDB revision 14](https://grafana.com/api/dashboards/12567/revisions/14/download), [Prometheus revision 14](https://grafana.com/api/dashboards/13054/revisions/14/download), [InfluxDB TDG revision 3](https://grafana.com/api/dashboards/16405/revisions/3/download), [Prometheus TDG revision 3](https://grafana.com/api/dashboards/16406/revisions/3/download).
 

Makefile

@@ -1,6 +1,7 @@
 JOB ?= tarantool
 POLICY ?= autogen
 MEASUREMENT ?= tarantool_http
+WITH_INSTANCE_VARIABLE ?= FALSE
 OUTPUT_STATIC_DASHBOARD ?= dashboard.json
 
 .PHONY: build-deps
@@ -16,9 +17,11 @@ ifndef DATASOURCE
 		false
 endif
 	# JOB is optional, default is "tarantool"
+	# WITH_INSTANCE_VARIABLE is optional, default is "FALSE"
 	jsonnet -J ./vendor -J . \
 		--ext-str DATASOURCE=${DATASOURCE} \
 		--ext-str JOB=${JOB} \
+		--ext-str WITH_INSTANCE_VARIABLE=${WITH_INSTANCE_VARIABLE} \
 		dashboard/build/prometheus/${DASHBOARD_BUILD_SOURCE} -o ${OUTPUT_STATIC_DASHBOARD}
 
 .PHONY: build-static-prometheus
@@ -37,10 +40,12 @@ ifndef DATASOURCE
 endif
 	# POLICY is optional, default is "autogen"
 	# MEASUREMENT is optional, default is "tarantool_http"
+	# WITH_INSTANCE_VARIABLE is optional, default is "FALSE"
 	jsonnet -J ./vendor -J . \
 		--ext-str DATASOURCE=${DATASOURCE} \
 		--ext-str POLICY=${POLICY} \
 		--ext-str MEASUREMENT=${MEASUREMENT} \
+		--ext-str WITH_INSTANCE_VARIABLE=${WITH_INSTANCE_VARIABLE} \
 		dashboard/build/influxdb/${DASHBOARD_BUILD_SOURCE} -o ${OUTPUT_STATIC_DASHBOARD}
 
 .PHONY: build-static-influxdb