fix prometheus duplicated metrics (#6911)

* fix prometheus duplicated metrics

* changeset

* chore(dependencies): updated changesets for modified dependencies

* remove local linked dependency

* fix type import

* chore(dependencies): updated changesets for modified dependencies

* better options

* update changeset

* update documentation

* better changeset

* export metrics customization functions and types

* use stable version of the yoga plugin

* update lockfile

* chore(dependencies): updated changesets for modified dependencies

---------

Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

Author: EmrysMyrddin

.changeset/@graphql-mesh_plugin-prometheus-6911-dependencies.md

@@ -0,0 +1,5 @@
+---
+"@graphql-mesh/plugin-prometheus": patch
+---
+dependencies updates:
+  - Updated dependency [`@graphql-yoga/plugin-prometheus@^5.0.0` ↗︎](https://www.npmjs.com/package/@graphql-yoga/plugin-prometheus/v/5.0.0) (from `^4.1.0`, in `dependencies`)

.changeset/beige-pillows-move.md

@@ -0,0 +1,73 @@
+---
+'@graphql-mesh/plugin-prometheus': minor
+---
+
+Adds a cache for metrics definition (Summary, Histogram and Counter).
+
+Fixes an issue preventing this plugin to be initialized multiple times, leading to metrics
+duplication error (https://github.com/ardatan/graphql-mesh/issues/6545).
+
+## Behavior Breaking Change:
+
+Due to Prometheus client API limitations, a metric is only defined once for a given registry. This
+means that if the configuration of the metrics, it will be silently ignored on plugin
+re-initialization.
+
+This is to avoid potential loss of metrics data produced between the plugin re-initialization and
+the last pull by the prometheus agent.
+
+If you need to be sure metrics configuration is up to date after a plugin re-initialization, you can
+either:
+
+- restart the whole node process instead of just recreating a graphql server at runtime
+- clear the registry using `registry.clear()` before plugin re-initialization:
+  ```ts
+  function usePrometheusWithReset() {
+    registry.clear()
+    return usePrometheus({ ... })
+  }
+  ```
+- use a new registry for each plugin instance:
+  ```ts
+  function usePrometheusWithRegistry() {
+    const registry = new Registry()
+    return usePrometheus({
+      registry,
+      ...
+    })
+  }
+  ```
+
+Keep in mind that this implies potential data loss in pull mode.
+
+## New configuration options
+
+Each metrics can now be fully customized. You can use the new factories `createHistogram`,
+`createCounter` and `createSummary` to provide your own configuration for each metrics.
+
+**Example:**
+
+```ts
+import { usePrometheus, createHistogram, createCounter, createSummary } from '@graphql-mesh/plugin-prometheus'
+import { Registry } from 'prom-client'
+
+const registry = new Registry()
+
+usePrometheus({
+  registry,
+  parse: createHistogram({
+    registry: registry // make sure to add your custom registry, if you are not using the default one
+    histogram: new Histogram({
+      name: 'my_custom_name',
+      help: 'HELP ME',
+      labelNames: ['opText'] as const,
+    }),
+    fillLabelsFn: params => {
+      // if you wish to fill your `labels` with metadata, you can use the params in order to get access to things like DocumentNode, operationName, operationType, `error` (for error metrics) and `info` (for resolvers metrics)
+      return {
+        opText: print(params.document)
+      }
+    }
+  })
+})
+```

.prettierignore

@@ -1,4 +1,3 @@
-/.changeset/*.md
 /website/src/generated-markdown/
 /website/src/pages/docs/api/
 .next/

.vscode/settings.json

@@ -5,7 +5,7 @@
   },
   "editor.tabSize": 2,
   "editor.insertSpaces": true,
-  "editor.rulers": [80],
+  "editor.rulers": [100],
   "editor.wordWrapColumn": 110,
   "prettier.semi": true,
   "files.trimTrailingWhitespace": true,

packages/plugins/prometheus/package.json

@@ -41,7 +41,7 @@
   },
   "dependencies": {
     "@graphql-mesh/serve-runtime": "^0.3.4",
-    "@graphql-yoga/plugin-prometheus": "^4.1.0"
+    "@graphql-yoga/plugin-prometheus": "^5.0.0"
   },
   "devDependencies": {
     "prom-client": "15.1.2"