PMM-7 Maintenance update

.github/CODEOWNERS

@@ -1 +1 @@
-*	@artemgavrilov
+*	@ademidoff

.github/workflows/ci.yml

@@ -12,78 +12,61 @@ jobs:
   test:
     name: Test
     timeout-minutes: 10
-
-    strategy:
-      fail-fast: false
-      matrix:
-        go-version: [1.16.x]
-        may-fail: [false]
-        include:
-          - go-version: tip
-            may-fail: true
-
-    continue-on-error: ${{ matrix.may-fail }}
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-22.04
 
     steps:
-      - name: Set up Go release
-        if: matrix.go-version != 'tip'
-        uses: percona-platform/setup-go@v2
+      - name: Check out code
+        uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
         with:
-          go-version: ${{ matrix.go-version }}
+          lfs: true
 
-      - name: Set up Go tip
-        if: matrix.go-version == 'tip'
-        run: |
-          git clone --depth=1 https://go.googlesource.com/go $HOME/gotip
-          cd $HOME/gotip/src
-          ./make.bash
-          echo "GOROOT=$HOME/gotip" >> $GITHUB_ENV
-          echo "$HOME/gotip/bin" >> $GITHUB_PATH
+      - name: Set up Go
+        uses: actions/setup-go@44694675825211faa026b3c33043df3e48a5fa00 # v6.0.0
+        with:
+          go-version-file: ${{ github.workspace }}/go.mod
+          cache: false
 
       - name: Set GO_VERSION environment variable
         run: |
           go version
           echo "GO_VERSION=$(go version)" >> $GITHUB_ENV
 
-      - name: Check out code into the Go module directory
-        uses: percona-platform/checkout@v2
-        with:
-          lfs: true
-
       - name: Enable Go modules cache
-        uses: percona-platform/cache@v2
+        uses: actions/cache@0057852bfaa89a56745cba8c7296529d2fc39830 # v4.3.0
         with:
           path: ~/go/pkg/mod
-          key: ${{ matrix.os }}-go-${{ matrix.go-version }}-modules-${{ hashFiles('**/go.sum') }}
+          key: ${{ runner.os }}-go-modules-${{ hashFiles('**/go.sum') }}
           restore-keys: |
-            ${{ matrix.os }}-go-${{ matrix.go-version }}-modules-
+            ${{ runner.os }}-go-modules-
 
       - name: Enable Go build cache
-        uses: percona-platform/cache@v2
+        uses: actions/cache@0057852bfaa89a56745cba8c7296529d2fc39830 # v4.3.0
         with:
           path: ~/.cache/go-build
-          key: ${{ matrix.os }}-go-${{ matrix.go-version }}-build-${{ github.ref }}-${{ hashFiles('**') }}
+          key: ${{ runner.os }}-go-build-${{ github.ref }}-${{ hashFiles('**') }}
           restore-keys: |
-            ${{ matrix.os }}-go-${{ matrix.go-version }}-build-${{ github.ref }}-
-            ${{ matrix.os }}-go-${{ matrix.go-version }}-build-
+            ${{ runner.os }}-go-build-${{ github.ref }}-
+            ${{ runner.os }}-go-build-
 
       - name: Download Go modules
-        run: go mod download
+        run: go mod download -x
 
       - name: Install development tools
         run: make init
 
+      - name: Format the code
+        run: make format
+
       - name: Run tests
         run: |
           go clean -testcache
           make test-crosscover
 
       - name: Upload coverage results
-        uses: percona-platform/codecov-action@v1
+        uses: codecov/codecov-action@5a1091511ad55cbe89839c7260b706298ca349f7 # v5.5.1
         with:
           token: ${{ secrets.CODECOV_TOKEN }}
-          file: crosscover.out
+          files: crosscover.out
           flags: crosscover
           env_vars: GO_VERSION
           fail_ci_if_error: false
@@ -101,82 +84,58 @@ jobs:
       - name: Run debug commands on failure
         if: ${{ failure() }}
         run: |
-          env
-          go version
-          go env
-          pwd
+          echo "--------------- ENVIRONMENT ---------------"
+          env | sort
+          echo "--------------- GO ENV ---------------"
+          go env | sort
           git status
 
   check:
     name: Check
     timeout-minutes: 10
     if: github.event_name == 'pull_request'
 
-    strategy:
-      fail-fast: false
-      matrix:
-        go-version: [1.16.x]
-        may-fail: [false]
-
-    continue-on-error: ${{ matrix.may-fail }}
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-22.04
 
     steps:
-      - name: Set up Go release
-        if: matrix.go-version != 'tip'
-        uses: percona-platform/setup-go@v2
+      - name: Check out code
+        uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
         with:
-          go-version: ${{ matrix.go-version }}
-
-      - name: Set up Go tip
-        if: matrix.go-version == 'tip'
-        run: |
-          git clone --depth=1 https://go.googlesource.com/go $HOME/gotip
-          cd $HOME/gotip/src
-          ./make.bash
-          echo "GOROOT=$HOME/gotip" >> $GITHUB_ENV
-          echo "$HOME/gotip/bin" >> $GITHUB_PATH
-
-      - name: Set GO_VERSION environment variable
-        run: |
-          go version
-          echo "GO_VERSION=$(go version)" >> $GITHUB_ENV
+          lfs: true
 
-      - name: Check out code into the Go module directory
-        uses: percona-platform/checkout@v2
+      - name: Set up Go
+        uses: actions/setup-go@44694675825211faa026b3c33043df3e48a5fa00 # v6.0.0
         with:
-          lfs: true
+          go-version-file: ${{ github.workspace }}/go.mod
+          cache: false
 
       - name: Enable Go modules cache
-        uses: percona-platform/cache@v2
+        uses: actions/cache@0057852bfaa89a56745cba8c7296529d2fc39830 # v4.3.0
         with:
           path: ~/go/pkg/mod
-          key: ${{ matrix.os }}-go-${{ matrix.go-version }}-modules-${{ hashFiles('**/go.sum') }}
+          key: ${{ runner.os }}-go-modules-${{ hashFiles('**/go.sum') }}
           restore-keys: |
-            ${{ matrix.os }}-go-${{ matrix.go-version }}-modules-
+            ${{ runner.os }}-go-modules-
 
       - name: Enable Go build cache
-        uses: percona-platform/cache@v2
+        uses: actions/cache@0057852bfaa89a56745cba8c7296529d2fc39830 # v4.3.0
         with:
           path: ~/.cache/go-build
-          key: ${{ matrix.os }}-go-${{ matrix.go-version }}-build-${{ github.ref }}-${{ hashFiles('**') }}
+          key: ${{ runner.os }}-go-build-${{ github.ref }}-${{ hashFiles('**') }}
           restore-keys: |
-            ${{ matrix.os }}-go-${{ matrix.go-version }}-build-${{ github.ref }}-
-            ${{ matrix.os }}-go-${{ matrix.go-version }}-build-
+            ${{ runner.os }}-go-build-${{ github.ref }}-
+            ${{ runner.os }}-go-build-
 
       - name: Download Go modules
-        run: go mod download
+        run: go mod download -x
 
       - name: Install tools
         run: make init
 
       - name: Run checks/linters
         run: |
-          # use GITHUB_TOKEN because only it has access to GitHub Checks API
-          bin/golangci-lint run -c=.golangci-required.yml --out-format=line-number | env REVIEWDOG_GITHUB_API_TOKEN=${{ secrets.GITHUB_TOKEN }} bin/reviewdog -f=golangci-lint -name='Required checks' -reporter=github-pr-check
-
           # use ROBOT_TOKEN for better reviewer's name
-          bin/golangci-lint run --out-format=line-number | env REVIEWDOG_GITHUB_API_TOKEN=${{ secrets.ROBOT_TOKEN }} bin/reviewdog -f=golangci-lint -name='Linters' -reporter=github-pr-review
+          bin/golangci-lint run --out-format=line-number | env REVIEWDOG_GITHUB_API_TOKEN=${{ secrets.GITHUB_TOKEN }} bin/reviewdog -f=golangci-lint -name='Linters' -reporter=github-pr-review
 
           # run it like that until some of those issues/PRs are resolved:
           # * https://github.com/quasilyte/go-consistent/issues/33
@@ -197,8 +156,8 @@ jobs:
       - name: Run debug commands on failure
         if: ${{ failure() }}
         run: |
-          env
-          go version
-          go env
-          pwd
+          echo "--------------- ENVIRONMENT ---------------"
+          env | sort
+          echo "--------------- GO ENV ---------------"          
+          go env | sort
           git status

.golangci.bck.yml

@@ -0,0 +1,48 @@
+---
+# Almost all linters; some of them are optional.
+
+linters-settings:
+  depguard:
+    list-type: blacklist
+    include-go-root: true
+    packages:
+      # use "gopkg.in/yaml.v2" instead
+      - gopkg.in/yaml.v3
+
+  goimports:
+    local-prefixes: github.com/percona/promconfig
+
+  tagliatelle:
+    case:
+      rules:
+        yaml: snake
+
+  unused:
+    check-exported: true
+
+  unparam:
+    check-exported: true
+
+linters:
+  enable-all: true
+  disable:
+    - exhaustivestruct # too annoying
+    - gci              # works poorly
+    - goerr113         # we use pkg/errors for stack traces
+    - golint           # deprecated
+    - gomnd            # too annoying
+    - interfacer       # deprecated
+    - maligned         # deprecated
+    - nlreturn         # conflicts with formatter
+    - scopelint        # deprecated
+    - wrapcheck        # forces to wrap errors everywhere
+    - wsl              # too annoying
+
+issues:
+  exclude-use-default: false
+  exclude-rules:
+    - path: _test\.go
+      linters:
+        - funlen       # tests may be long
+        - testpackage  # senseless
+        - unused       # very annoying false positive: https://github.com/golangci/golangci-lint/issues/791