dashboards/.*.json to jinja2 (#47)

Main intent was to extend the JSON dashboards to support more dynamic "job" names and to be able to switch out "instance" dashboard legends with "pod" keys.

After this update most of the dashboards under dashboards/ are Jinja2 templates and the generate_dashboard.sh script
now supports checking for and prompting if missing input/env vars which also resolves issue #45

Visual verification of post rendered templates was done.

dashboards/jvm.json → dashboards/jvm.json.j2

@@ -1,3 +1,12 @@
+{%- if PULSAR_CUSTOM_PROMETHEUS not in [ '','no','No','NO','na','NA','false','False','0' ] %}
+{#-
+If custom change "instance" key to "pod"
+This will make graph ledgends display the pod name instead of IP and port information
+#}
+  {%- set CONTEXT = "pod" %}
+{%- else %}
+  {%- set CONTEXT = "instance" %}
+{%- endif -%}
 {
   "__inputs": [
     {
@@ -102,11 +111,11 @@
       "steppedLine": false,
       "targets": [
         {
-          "expr": "irate(process_cpu_seconds_total{instance=~\"$instance\"}[30s]) * 100\n\n",
+          "expr": "irate(process_cpu_seconds_total{{ '{' }}{{ CONTEXT }}=~\"$instance\"}[30s]) * 100\n\n",
           "format": "time_series",
           "interval": "",
           "intervalFactor": 2,
-          "legendFormat": "{{instance}}",
+          "legendFormat": "{{ '{{' }} {{ CONTEXT }} {{ '}}' }}",
           "metric": "process_cpu_seconds_total",
           "refId": "A",
           "step": 20
@@ -200,7 +209,7 @@
       "steppedLine": false,
       "targets": [
         {
-          "expr": "sum(jvm_memory_bytes_committed{instance=~\"$instance\"})",
+          "expr": "sum(jvm_memory_bytes_committed{{ '{' }}{{ CONTEXT }}=~\"$instance\"})",
           "format": "time_series",
           "hide": false,
           "interval": "",
@@ -211,7 +220,7 @@
           "step": 20
         },
         {
-          "expr": "sum(jvm_memory_bytes_used{instance=~\"$instance\"})",
+          "expr": "sum(jvm_memory_bytes_used{{ '{' }}{{ CONTEXT }}=~\"$instance\"})",
           "format": "time_series",
           "interval": "",
           "intervalFactor": 2,
@@ -221,7 +230,7 @@
           "step": 20
         },
         {
-          "expr": "sum(jvm_memory_bytes_max{instance=~\"$instance\"})",
+          "expr": "sum(jvm_memory_bytes_max{{ '{' }}{{ CONTEXT }}=~\"$instance\"})",
           "format": "time_series",
           "interval": "",
           "intervalFactor": 2,
@@ -308,7 +317,7 @@
       "steppedLine": false,
       "targets": [
         {
-          "expr": "jvm_memory_direct_bytes_used{instance=~\"$instance\"}",
+          "expr": "jvm_memory_direct_bytes_used{{ '{' }}{{ CONTEXT }}=~\"$instance\"}",
           "format": "time_series",
           "interval": "",
           "intervalFactor": 2,
@@ -318,7 +327,7 @@
           "step": 20
         },
         {
-          "expr": "jvm_memory_direct_bytes_max{instance=~\"$instance\"}",
+          "expr": "jvm_memory_direct_bytes_max{{ '{' }}{{ CONTEXT }}=~\"$instance\"}",
           "format": "time_series",
           "interval": "",
           "intervalFactor": 2,
@@ -414,7 +423,7 @@
       "steppedLine": false,
       "targets": [
         {
-          "expr": "sum(increase(jvm_gc_collection_seconds_sum{instance=~\"$instance\"}[30s]))",
+          "expr": "sum(increase(jvm_gc_collection_seconds_sum{{ '{' }}{{ CONTEXT }}=~\"$instance\"}[30s]))",
           "format": "time_series",
           "hide": false,
           "interval": "",
@@ -526,7 +535,7 @@
         "multi": true,
         "name": "instance",
         "options": [],
-        "query": "jvm_memory_bytes_used{job=~\"$job\", instance=~\".+\"}",
+        "query": "jvm_memory_bytes_used{job=~\"$job\", {{ CONTEXT }}=~\".+\"}",
         "refresh": 2,
         "regex": "/.*[^_]instance=\\\"([^\\\"]+)\\\".*/",
         "skipUrlSync": false,