chore: migrate from super-linter to flint v2

.codespellrc

@@ -1,5 +1,6 @@
 [codespell]
-# Ignore words that are valid technical terms:
-# - vertx: Vert.x reactive framework
-# - errorprone: Error Prone static analysis tool
-ignore-words-list = vertx,errorprone
+# nd: legitimate variable name in quantile algorithms
+# atmost: AssertJ atMost() matcher
+# re-use: hyphenated form used in comments
+# errorprone: Google ErrorProne tool name
+ignore-words-list = nd,atmost,re-use,errorprone

.editorconfig

@@ -7,7 +7,7 @@ indent_size = 2
 [{version-rules.xml,maven-wrapper.properties,checkstyle.xml,docker-compose.yaml,docker-compose.yml,Dockerfile,example_target_info.json,mise.toml,mvnm,mvnw.cmd,generate-protobuf.sh,.gitleaksignore,prometheus.properties}]
 max_line_length = 200
 
-[{grafana-dashboard-*.json,.editorconfig,super-linter.env,lychee.toml,renovate.json5}]
+[{grafana-dashboard-*.json,.editorconfig,super-linter.env,lychee.toml,renovate.json5,CODE_OF_CONDUCT.md}]
 max_line_length = 300
 
 [pom.xml]
@@ -18,5 +18,5 @@ max_line_length = 210
 indent_size = 4
 max_line_length = 120
 
-[{.mise/tasks/build-release.sh,.github/workflows/multi-version-test.yml}]
-max_line_length = 200
+[{.mise/tasks/build-release.sh,.github/workflows/*.yml}]
+max_line_length = 300

.github/config/.editorconfig-checker.json

@@ -0,0 +1,3 @@
+{
+  "Exclude": [".*\\.java$"]
+}

.github/config/flint.toml

@@ -0,0 +1,10 @@
+[settings]
+exclude = [
+    "**/src/main/generated/**",
+    "docs/themes/**",
+    "mvnw",
+    "simpleclient-archive/**",
+]
+
+[checks.renovate-deps]
+exclude_managers = ["github-actions", "github-runners"]

.github/renovate-tracked-deps.json

@@ -1,42 +1,68 @@
 {
   ".github/renovate.json5": {
-    "renovate-config-presets": ["grafana/flint"]
+    "renovate-config-presets": [
+      "grafana/flint"
+    ]
   },
   ".github/workflows/acceptance-tests.yml": {
-    "regex": ["mise"]
+    "regex": [
+      "mise"
+    ]
   },
   ".github/workflows/build.yml": {
-    "regex": ["mise"]
+    "regex": [
+      "mise"
+    ]
   },
   ".github/workflows/generate-protobuf.yml": {
-    "regex": ["mise"]
+    "regex": [
+      "mise"
+    ]
   },
   ".github/workflows/github-pages.yaml": {
-    "regex": ["mise"]
+    "regex": [
+      "mise"
+    ]
   },
   ".github/workflows/java-version-matrix-tests.yml": {
-    "regex": ["mise"]
+    "regex": [
+      "mise"
+    ]
   },
   ".github/workflows/lint.yml": {
-    "regex": ["mise"]
+    "regex": [
+      "mise"
+    ]
   },
   ".github/workflows/native-tests.yml": {
-    "regex": ["mise"]
+    "regex": [
+      "mise"
+    ]
   },
   ".github/workflows/nightly-benchmarks.yml": {
-    "regex": ["mise"]
+    "regex": [
+      "mise"
+    ]
   },
   ".github/workflows/release.yml": {
-    "regex": ["mise"]
+    "regex": [
+      "mise"
+    ]
   },
   ".github/workflows/test-release-build.yml": {
-    "regex": ["mise"]
+    "regex": [
+      "mise"
+    ]
   },
   ".mise/envs/native/mise.toml": {
-    "mise": ["java"]
+    "mise": [
+      "java"
+    ]
   },
   ".mvn/wrapper/maven-wrapper.properties": {
-    "maven-wrapper": ["maven"]
+    "maven-wrapper": [
+      "maven"
+    ]
   },
   "benchmarks/pom.xml": {
     "maven": [
@@ -94,13 +120,21 @@
     ]
   },
   "integration-tests/it-exporter/it-exporter-test/pom.xml": {
-    "maven": ["io.prometheus:it-common", "io.prometheus:it-exporter"]
+    "maven": [
+      "io.prometheus:it-common",
+      "io.prometheus:it-exporter"
+    ]
   },
   "integration-tests/it-exporter/it-no-protobuf-test/pom.xml": {
-    "maven": ["io.prometheus:it-common", "io.prometheus:it-exporter"]
+    "maven": [
+      "io.prometheus:it-common",
+      "io.prometheus:it-exporter"
+    ]
   },
   "integration-tests/it-exporter/pom.xml": {
-    "maven": ["io.prometheus:integration-tests"]
+    "maven": [
+      "io.prometheus:integration-tests"
+    ]
   },
   "integration-tests/it-pushgateway/pom.xml": {
     "maven": [
@@ -114,7 +148,6 @@
   },
   "integration-tests/it-spring-boot-smoke-test/pom.xml": {
     "maven": [
-      "com.diffplug.spotless:spotless-maven-plugin",
       "io.prometheus:it-common",
       "io.prometheus:prometheus-metrics-bom",
       "org.junit:junit-bom",
@@ -130,22 +163,35 @@
   },
   "mise.toml": {
     "mise": [
+      "actionlint",
+      "cargo:https://github.com/grafana/flint",
+      "cargo:xmloxide",
+      "editorconfig-checker",
+      "github:google/google-java-format",
       "go:github.com/gohugoio/hugo",
       "go:github.com/grafana/oats",
       "java",
       "lychee",
       "node",
+      "npm:markdownlint-cli2",
+      "npm:prettier",
       "npm:renovate",
+      "pipx:codespell",
+      "pipx:ruff",
       "protoc",
-      "ubi:google/google-java-format"
-    ],
-    "regex": ["ghcr.io/super-linter/super-linter", "grafana/flint"]
+      "shellcheck",
+      "shfmt"
+    ]
   },
   "mvnw": {
-    "maven-wrapper": ["maven-wrapper"]
+    "maven-wrapper": [
+      "maven-wrapper"
+    ]
   },
   "mvnw.cmd": {
-    "maven-wrapper": ["maven-wrapper"]
+    "maven-wrapper": [
+      "maven-wrapper"
+    ]
   },
   "pom.xml": {
     "maven": [
@@ -219,7 +265,9 @@
     ]
   },
   "prometheus-metrics-config/pom.xml": {
-    "maven": ["io.prometheus:client_java"]
+    "maven": [
+      "io.prometheus:client_java"
+    ]
   },
   "prometheus-metrics-core/pom.xml": {
     "maven": [
@@ -241,7 +289,10 @@
     ]
   },
   "prometheus-metrics-exporter-httpserver/pom.xml": {
-    "maven": ["io.prometheus:client_java", "io.prometheus:prometheus-metrics-exporter-common"]
+    "maven": [
+      "io.prometheus:client_java",
+      "io.prometheus:prometheus-metrics-exporter-common"
+    ]
   },
   "prometheus-metrics-exporter-opentelemetry-otel-agent-resources/pom.xml": {
     "maven": [
@@ -350,14 +401,18 @@
     ]
   },
   "prometheus-metrics-model/pom.xml": {
-    "maven": ["io.prometheus:client_java", "io.prometheus:prometheus-metrics-config"]
+    "maven": [
+      "io.prometheus:client_java",
+      "io.prometheus:prometheus-metrics-config"
+    ]
   },
   "prometheus-metrics-otel-support/pom.xml": {
-    "maven": ["io.prometheus:client_java"]
+    "maven": [
+      "io.prometheus:client_java"
+    ]
   },
   "prometheus-metrics-parent/pom.xml": {
     "maven": [
-      "com.diffplug.spotless:spotless-maven-plugin",
       "org.apache.maven.plugins:maven-gpg-plugin",
       "org.apache.maven.plugins:maven-source-plugin",
       "org.sonatype.central:central-publishing-maven-plugin"
@@ -374,10 +429,14 @@
     ]
   },
   "prometheus-metrics-tracer/pom.xml": {
-    "maven": ["io.prometheus:client_java"]
+    "maven": [
+      "io.prometheus:client_java"
+    ]
   },
   "prometheus-metrics-tracer/prometheus-metrics-tracer-common/pom.xml": {
-    "maven": ["io.prometheus:prometheus-metrics-tracer"]
+    "maven": [
+      "io.prometheus:prometheus-metrics-tracer"
+    ]
   },
   "prometheus-metrics-tracer/prometheus-metrics-tracer-initializer/pom.xml": {
     "maven": [
@@ -400,7 +459,9 @@
     ]
   },
   "simpleclient-archive/integration_tests/it_common/pom.xml": {
-    "maven": ["io.prometheus:integration_tests"]
+    "maven": [
+      "io.prometheus:integration_tests"
+    ]
   },
   "simpleclient-archive/integration_tests/it_exemplars_otel_agent/pom.xml": {
     "maven": [
@@ -475,7 +536,10 @@
     ]
   },
   "simpleclient-archive/simpleclient_graphite_bridge/pom.xml": {
-    "maven": ["io.prometheus:client_java", "io.prometheus:simpleclient"]
+    "maven": [
+      "io.prometheus:client_java",
+      "io.prometheus:simpleclient"
+    ]
   },
   "simpleclient-archive/simpleclient_hibernate/pom.xml": {
     "maven": [

.github/workflows/java-version-matrix-tests.yml

@@ -4,11 +4,11 @@ name: Integration Tests - Java Version Compatibility Matrix
 on:
   pull_request:
     paths:
-      - 'integration-tests/**'
-      - 'prometheus-metrics-core/**'
-      - 'prometheus-metrics-exporter-*/**'
-      - 'prometheus-metrics-exposition-*/**'
-      - '.github/workflows/java-version-matrix-tests.yml'
+      - "integration-tests/**"
+      - "prometheus-metrics-core/**"
+      - "prometheus-metrics-exporter-*/**"
+      - "prometheus-metrics-exposition-*/**"
+      - ".github/workflows/java-version-matrix-tests.yml"
   push:
     branches:
       - main
@@ -23,7 +23,6 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        # Note: Java 8 runtime testing is skipped due to Spotless incompatibility
         java-version: [11, 17, 21, 25]
     steps:
       - name: Check out
@@ -46,15 +45,14 @@ jobs:
             ${{ runner.os }}-maven-
 
       - name: Build core library artifacts
-        run: mise exec -- ./mvnw install -DskipTests -Dspotless.check.skip=true -Dcoverage.skip=true -Dcheckstyle.skip=true -Dwarnings=-nowarn -pl '!integration-tests'
+        run: mise exec -- ./mvnw install -DskipTests -Dcoverage.skip=true -Dcheckstyle.skip=true -Dwarnings=-nowarn -pl '!integration-tests'
 
       - name: Install parent POMs
         run: |
           cd integration-tests
-          mise exec -- ../mvnw clean install -N -Dspotless.skip=true
+          mise exec -- ../mvnw clean install -N
           cd it-exporter
-          mise exec -- ../../mvnw install -N -Dspotless.skip=true
-
+          mise exec -- ../../mvnw install -N
       - name: Rebuild sample apps targeting Java ${{ matrix.java-version }}
         run: |
           cd integration-tests
@@ -64,7 +62,7 @@ jobs:
           else
             MODULES="it-common,it-exporter/it-exporter-httpserver-sample,it-exporter/it-exporter-servlet-tomcat-sample,it-exporter/it-exporter-servlet-jetty-sample,it-exporter/it-exporter-no-protobuf,it-pushgateway"
           fi
-          mise exec -- ../mvnw clean install -DskipTests -Dspotless.skip=true -Dcoverage.skip=true -Dcheckstyle.skip=true -Dwarnings=-nowarn \
+          mise exec -- ../mvnw clean install -DskipTests -Dcoverage.skip=true -Dcheckstyle.skip=true -Dwarnings=-nowarn \
             -Djava.version=${{ matrix.java-version }} \
             -Dmaven.compiler.release=${{ matrix.java-version }} \
             -pl $MODULES
@@ -80,5 +78,5 @@ jobs:
           else
             TEST_MODULES="it-exporter/it-exporter-test,it-exporter/it-no-protobuf-test,it-pushgateway"
           fi
-          mise exec -- ../mvnw verify -T 2C -Dspotless.skip=true -Dcoverage.skip=true -Dcheckstyle.skip=true -Dwarnings=-nowarn \
+          mise exec -- ../mvnw verify -T 2C -Dcoverage.skip=true -Dcheckstyle.skip=true -Dwarnings=-nowarn \
             -pl $TEST_MODULES

.github/workflows/multi-version-test.yml

@@ -36,4 +36,4 @@ jobs:
             ${{ runner.os }}-maven-
 
       - name: Build and test on Java ${{ matrix.java }}
-        run: ./mvnw clean install -Dtest.java.version=${{ matrix.java }} -Dspotless.skip=true -Dcheckstyle.skip=true -Dwarnings=-nowarn -Dcoverage.skip=true
+        run: ./mvnw clean install -Dtest.java.version=${{ matrix.java }} -Dcheckstyle.skip=true -Dwarnings=-nowarn -Dcoverage.skip=true

.markdownlint.jsonc

@@ -0,0 +1,6 @@
+{
+  // Line length — pre-existing across docs, README, benchmarks
+  "MD013": false,
+  // Inline HTML — needed for badge images in README
+  "MD033": false
+}