feat: add database metrics (#1079)

Co-authored-by: Tomás Grüner <[email protected]>

Author: avilagaston9

lib/lambda_ethereum_consensus/store/db.ex

@@ -30,6 +30,13 @@ defmodule LambdaEthereumConsensus.Store.Db do
     Exleveldb.get(ref, key)
   end
 
+  @spec size() :: non_neg_integer()
+  def size() do
+    ref = GenServer.call(@registered_name, :get_ref)
+    {:ok, size} = :eleveldb.status(ref, "leveldb.total-bytes")
+    String.to_integer(size)
+  end
+
   @spec iterate() :: {:ok, :eleveldb.itr_ref()} | {:error, any()}
   def iterate() do
     ref = GenServer.call(@registered_name, :get_ref)

lib/lambda_ethereum_consensus/telemetry.ex

@@ -2,6 +2,7 @@ defmodule LambdaEthereumConsensus.Telemetry do
   @moduledoc """
   Telemetry module for the consensus node.
   """
+  alias LambdaEthereumConsensus.Store.Db
   use Supervisor
   require Logger
   import Telemetry.Metrics
@@ -118,7 +119,10 @@ defmodule LambdaEthereumConsensus.Telemetry do
       last_value("vm.system_counts.atom_count"),
       last_value("vm.system_counts.port_count"),
       last_value("vm.message_queue.length", tags: [:process]),
-      last_value("vm.uptime.total", unit: :millisecond)
+      last_value("vm.uptime.total", unit: :millisecond),
+
+      # Db Metrics
+      last_value("db.size.total", unit: :byte)
     ]
   end
 
@@ -127,10 +131,16 @@ defmodule LambdaEthereumConsensus.Telemetry do
       # A module, function and arguments to be invoked periodically.
       # This function must call :telemetry.execute/3 and a metric must be added above.
       {__MODULE__, :message_queue_lengths, []},
-      {__MODULE__, :uptime, []}
+      {__MODULE__, :uptime, []},
+      {__MODULE__, :db_size, []}
     ]
   end
 
+  def db_size() do
+    db_size = Db.size()
+    :telemetry.execute([:db, :size], %{total: db_size})
+  end
+
   def uptime() do
     {uptime, _} = :erlang.statistics(:wall_clock)
     :telemetry.execute([:vm, :uptime], %{total: uptime})

metrics/grafana/provisioning/dashboards/home.json

@@ -28,6 +28,106 @@
   "links": [],
   "liveNow": false,
   "panels": [
+    {
+      "datasource": {
+        "type": "prometheus",
+        "uid": "PBFA97CFB590B2093"
+      },
+      "fieldConfig": {
+        "defaults": {
+          "color": {
+            "mode": "palette-classic"
+          },
+          "custom": {
+            "axisBorderShow": false,
+            "axisCenteredZero": false,
+            "axisColorMode": "text",
+            "axisLabel": "Bytes",
+            "axisPlacement": "auto",
+            "barAlignment": 0,
+            "drawStyle": "line",
+            "fillOpacity": 0,
+            "gradientMode": "none",
+            "hideFrom": {
+              "legend": false,
+              "tooltip": false,
+              "viz": false
+            },
+            "insertNulls": false,
+            "lineInterpolation": "linear",
+            "lineWidth": 1,
+            "pointSize": 6,
+            "scaleDistribution": {
+              "type": "linear"
+            },
+            "showPoints": "auto",
+            "spanNulls": false,
+            "stacking": {
+              "group": "A",
+              "mode": "none"
+            },
+            "thresholdsStyle": {
+              "mode": "off"
+            }
+          },
+          "mappings": [],
+          "thresholds": {
+            "mode": "absolute",
+            "steps": [
+              {
+                "color": "green",
+                "value": null
+              },
+              {
+                "color": "red",
+                "value": 80
+              }
+            ]
+          },
+          "unit": "decbytes"
+        },
+        "overrides": []
+      },
+      "gridPos": {
+        "h": 8,
+        "w": 12,
+        "x": 0,
+        "y": 0
+      },
+      "id": 1,
+      "options": {
+        "legend": {
+          "calcs": [],
+          "displayMode": "list",
+          "placement": "bottom",
+          "showLegend": false
+        },
+        "tooltip": {
+          "mode": "single",
+          "sort": "none"
+        }
+      },
+      "targets": [
+        {
+          "datasource": {
+            "type": "prometheus",
+            "uid": "PBFA97CFB590B2093"
+          },
+          "disableTextWrap": false,
+          "editorMode": "builder",
+          "expr": "db_size_total",
+          "fullMetaSearch": false,
+          "includeNullMetadata": true,
+          "instant": true,
+          "legendFormat": "__auto",
+          "range": true,
+          "refId": "A",
+          "useBackend": false
+        }
+      ],
+      "title": "Database size",
+      "type": "timeseries"
+    },
     {
       "datasource": {
         "type": "prometheus",