feat: initial

.dockerignore

@@ -0,0 +1,5 @@
+# More info: https://docs.docker.com/engine/reference/builder/#dockerignore-file
+# Ignore build and test binaries.
+bin/
+testbin/
+!bin/manager*

.editorconfig

@@ -0,0 +1,20 @@
+root = true
+
+[*]
+insert_final_newline = true
+charset = utf-8
+trim_trailing_whitespace = true
+indent_style = space
+indent_size = 4
+
+[{Makefile,go.mod,go.sum,*.go,.gitmodules}]
+indent_style = tab
+
+[*.md]
+trim_trailing_whitespace = false
+
+
+[{*.yml,*.yaml}]
+indent_size = 2
+
+

.github/workflows/license-check.yaml

@@ -0,0 +1,34 @@
+name: Check Go Dependency Licenses
+
+on:
+  workflow_call: {}
+  pull_request:
+    branches:
+      - main
+    paths:
+      - go.mod
+      - go.sum
+
+permissions:
+  contents: read
+
+jobs:
+  validate:
+    runs-on: ubuntu-latest
+    steps:
+      - name: checkout repo
+        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+
+      - uses: actions/setup-go@41dfa10bad2bb2ae585af6ee5bb4d7d973ad74ed # v5.1.0
+        with:
+          go-version: '1.24'
+
+      - name: Install go-licenses
+        run: |
+          go install github.com/google/go-licenses@latest
+
+      - name: check licenses
+        # Remove ignore before go live
+        run: |
+          go-licenses check --allowed_licenses="Apache-2.0,BSD-3-Clause,MIT,MPL-2.0,ISC,BSD-2-Clause" --ignore github.com/dynatrace-ace/dynatrace-go-api-client ./...
+

.github/workflows/reuse-scan.yaml

@@ -0,0 +1,18 @@
+# This workflow is triggered by the user and runs the REUSE compliance check (reuse lint) on the repository.
+
+name: REUSE Compliance Check
+
+on:
+  workflow_call: {}
+  pull_request:
+    branches:
+      - main
+
+
+jobs:
+  lint-reuse:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+      - name: REUSE Compliance Check
+        uses: fsfe/reuse-action@3ae3c6bdf1257ab19397fab11fd3312144692083 # v4.0.0

.github/workflows/reviewable.yaml

@@ -0,0 +1,36 @@
+# This workflow will run make reviewable and make check-diff as checks
+
+name: make reviewable && make check-Diff
+
+on:
+  workflow_call: {}
+  pull_request:
+    branches:
+      - main
+env:
+  GO_IMPORT_VERSION: 'v0.16.1'
+
+jobs:
+  run:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+        with:
+          submodules: true
+
+      - name: Set up Go
+        uses: actions/setup-go@41dfa10bad2bb2ae585af6ee5bb4d7d973ad74ed # v5.1.0
+        with:
+          go-version: '1.24'
+
+      - name: Install goimports
+        run: |
+          cd /tmp
+          go install golang.org/x/tools/cmd/goimports@${{ env.GO_IMPORT_VERSION }}
+
+      - name: make reviewable
+        run: make reviewable
+        env:
+          RUNNING_IN_CI: 'true'
+      - name: make check-diff
+        run: make check-diff

.gitignore

@@ -0,0 +1,33 @@
+
+# Binaries for programs and plugins
+*.exe
+*.exe~
+*.dll
+*.so
+*.dylib
+bin/*
+Dockerfile.cross
+
+.DS_Store
+
+# Test binary, build with `go test -c`
+*.test
+
+# Output of the go coverage tool, specifically when used with LiteIDE
+*.out
+
+# Kubernetes Generated files - skip generated files, except for vendored files
+
+!vendor/**/zz_generated.*
+
+# editor and IDE paraphernalia
+.idea
+.vscode
+*.swp
+*.swo
+*~
+
+# exclude secret
+examples/sample_secret.yaml
+examples/dynatrace_secret.yaml
+examples/secret.yaml

.golangci.yml

@@ -0,0 +1,196 @@
+linters-settings:
+  errcheck:
+    # report about not checking of errors in type assetions: `a := b.(MyStruct)`;
+    # default is false: such cases aren't reported by default.
+    check-type-assertions: false
+
+    # report about assignment of errors to blank identifier: `num, _ := strconv.Atoi(numStr)`;
+    # default is false: such cases aren't reported by default.
+    check-blank: false
+
+    # [deprecated] comma-separated list of pairs of the form pkg:regex
+    # the regex is used to ignore names within pkg. (default "fmt:.*").
+    # see https://github.com/kisielk/errcheck#the-deprecated-method for details
+    exclude-functions:
+      - fmt:.*
+      - io/ioutil:^Read.*
+
+  govet:
+    # report about shadowed variables
+    disable:
+      - shadow
+  gofmt:
+    # simplify code: gofmt with `-s` option, true by default
+    simplify: true
+
+  goimports:
+    # put imports beginning with prefix after 3rd-party packages;
+    # it's a comma-separated list of prefixes
+    local-prefixes: github.com/SAP/metrics-operator
+
+  gocyclo:
+    # minimal code complexity to report, 30 by default (but we recommend 10-20)
+    min-complexity: 10
+
+  dupl:
+    # tokens count to trigger issue, 150 by default
+    threshold: 100
+
+  goconst:
+    # minimal length of string constant, 3 by default
+    min-len: 3
+    # minimal occurrences count to trigger, 3 by default
+    min-occurrences: 5
+
+  lll:
+    # Max line length, lines longer will be reported.
+    # '\t' is counted as 1 character by default, and can be changed with the tab-width option.
+    # Default: 120.
+    line-length: 120
+    # Tab width in spaces.
+    # Default: 1
+    tab-width: 1
+
+  unused:
+    # treat code as a program (not a library) and report unused exported identifiers; default is false.
+    # XXX: if you enable this setting, unused will report a lot of false-positives in text editors:
+    # if it's called for subdir of a project it can't find funcs usages. All text editor integrations
+    # with golangci-lint call it on a directory with the changed file.
+    exported-fields-are-used: false
+
+  unparam:
+    # Inspect exported functions, default is false. Set to true if no external program/library imports your code.
+    # XXX: if you enable this setting, unparam will report a lot of false-positives in text editors:
+    # if it's called for subdir of a project it can't find external interfaces. All text editor integrations
+    # with golangci-lint call it on a directory with the changed file.
+    check-exported: false
+
+  nakedret:
+    # make an issue if func has more lines of code than this setting and it has naked returns; default is 30
+    max-func-lines: 30
+
+  prealloc:
+    # XXX: we don't recommend using this linter before doing performance profiling.
+    # For most programs usage of prealloc will be a premature optimization.
+
+    # Report preallocation suggestions only on simple loops that have no returns/breaks/continues/gotos in them.
+    # True by default.
+    simple: true
+    range-loops: true # Report preallocation suggestions on range loops, true by default
+    for-loops: false # Report preallocation suggestions on for loops, false by default
+
+  gocritic:
+    # Enable multiple checks by tags, run `GL_DEBUG=gocritic golangci-lint` run to see all tags and checks.
+    # Empty list by default. See https://github.com/go-critic/go-critic#usage -> section "Tags".
+    enabled-tags:
+      - performance
+
+    settings: # settings passed to gocritic
+      captLocal: # must be valid enabled check name
+        paramsOnly: true
+      rangeValCopy:
+        sizeThreshold: 32
+
+linters:
+  enable:
+    - gosimple
+    - staticcheck
+    - unused
+    - govet
+    - gocyclo
+    - gocritic
+    - goconst
+    - goimports
+    - gofmt  # We enable this as well as goimports for its simplify mode.
+    - prealloc
+    - revive
+    - unconvert
+    - misspell
+    - nakedret
+  disable:
+    - nilnesserr
+  presets:
+    - bugs
+    - unused
+  fast: false
+
+
+issues:
+  exclude-files:
+    - 'zz_generated.*\.go'
+  # Excluding configuration per-path and per-linter
+  exclude-rules:
+    # Exclude some linters from running on tests files.
+    - path: _test(ing)?\.go
+      linters:
+        - gocyclo
+        - errcheck
+        - dupl
+        - gosec
+        - scopelint
+        - unparam
+        - revive
+
+    # Ease some gocritic warnings on test files.
+    - path: _test\.go
+      text: "(unnamedResult|exitAfterDefer)"
+      linters:
+        - gocritic
+
+    # These are performance optimisations rather than style issues per se.
+    # They warn when function arguments or range values copy a lot of memory
+    # rather than using a pointer.
+    - text: "(hugeParam|rangeValCopy):"
+      linters:
+        - gocritic
+
+    # This "TestMain should call os.Exit to set exit code" warning is not clever
+    # enough to notice that we call a helper method that calls os.Exit.
+    - text: "SA3000:"
+      linters:
+        - staticcheck
+
+    - text: "k8s.io/api/core/v1"
+      linters:
+        - goimports
+
+    # This is a "potential hardcoded credentials" warning. It's triggered by
+    # any variable with 'secret' in the same, and thus hits a lot of false
+    # positives in Kubernetes land where a Secret is an object type.
+    - text: "G101:"
+      linters:
+        - gosec
+        - gas
+
+    # This is an 'errors unhandled' warning that duplicates errcheck.
+    - text: "G104:"
+      linters:
+        - gosec
+        - gas
+    # ease package comments rule
+    - text: "package-comments:"
+      linters:
+        - revive
+
+  # Independently from option `exclude` we use default exclude patterns,
+  # it can be disabled by this option. To list all
+  # excluded by default patterns execute `golangci-lint run --help`.
+  # Default value for this option is true.
+  exclude-use-default: false
+
+  # Show only new issues: if there are unstaged changes or untracked files,
+  # only those changes are analyzed, else only changes in HEAD~ are analyzed.
+  # It's a super-useful option for integration of golangci-lint into existing
+  # large codebase. It's not practical to fix all existing issues at the moment
+  # of integration: much better don't allow issues in new code.
+  # Default is false.
+  new: false
+
+  # Maximum issues count per one linter. Set to 0 to disable. Default is 50.
+  max-issues-per-linter: 0
+
+  # Maximum count of issues with the same text. Set to 0 to disable. Default is 3.
+  max-same-issues: 0
+
+run:
+  timeout: 10m

Dockerfile

@@ -0,0 +1,8 @@
+# Use distroless as minimal base image to package the manager binary
+# Refer to https://github.com/GoogleContainerTools/distroless for more details
+FROM gcr.io/distroless/static:nonroot
+WORKDIR /
+COPY bin/manager-linux.amd64 /manager
+USER 65532:65532
+
+ENTRYPOINT ["/manager"]