Previous versions of the coverage-model contained only a single software metric: the cyclomatic complexity. This metric has been extracted from the coverage model. This metric was published as aggregated total or maximum per class. (The metric is computed per method.)

Now the library contains support for a lot of additional metrics. In order to reduce the clutter, the selection of maximum or total has been removed. 
So now for some metrics it makes sense to use quality gates based on the absolute value, or the minimum or maximum, or average within a class. 
So we need to rework the quality gates to support this selection again.

Original stacktrace due to the changed functionality:


java.lang.IllegalArgumentException: No enum constant edu.hm.hafner.coverage.Metric.COMPLEXITY_MAXIMUM
	at java.base/java.lang.Enum.valueOf(Enum.java:293)
	at PluginClassLoader for structs//org.jenkinsci.plugins.structs.describable.DescribableModel.coerce(DescribableModel.java:482)
	at PluginClassLoader for structs//org.jenkinsci.plugins.structs.describable.DescribableModel.buildArguments(DescribableModel.java:415)
	at PluginClassLoader for structs//org.jenkinsci.plugins.structs.describable.DescribableModel.instantiate(DescribableModel.java:330)
Caused: java.lang.IllegalArgumentException: Could not instantiate \{metric=COMPLEXITY_MAXIMUM, criticality=UNSTABLE, threshold=30.0, baseline=PROJECT} for io.jenkins.plugins.coverage.metrics.steps.CoverageQualityGate
	at PluginClassLoader for structs//org.jenkinsci.plugins.structs.describable.DescribableModel.instantiate(DescribableModel.java:340)
	at PluginClassLoader for structs//org.jenkinsci.plugins.structs.describable.DescribableModel.coerce(DescribableModel.java:480)
	at PluginClassLoader for structs//org.jenkinsci.plugins.structs.describable.DescribableModel.coerceList(DescribableModel.java:591)
	at PluginClassLoader for structs//org.jenkinsci.plugins.structs.describable.DescribableModel.coerce(DescribableModel.java:464)
	at PluginClassLoader for structs//org.jenkinsci.plugins.structs.describable.DescribableModel.injectSetters(DescribableModel.java:435)
	at PluginClassLoader for structs//org.jenkinsci.plugins.structs.describable.DescribableModel.instantiate(DescribableModel.java:332)
	at PluginClassLoader for workflow-cps//org.jenkinsci.plugins.workflow.cps.DSL.invokeStep(DSL.java:306)
	at PluginClassLoader for workflow-cps//org.jenkinsci.plugins.workflow.cps.DSL.invokeMethod(DSL.java:196)
	at PluginClassLoader for workflow-cps//org.jenkinsci.plugins.workflow.cps.CpsScript.invokeMethod(CpsScript.java:124)
	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
	at java.base/java.lang.reflect.Method.invoke(Method.java:580)
	at org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:98)
	at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:325)
	at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1225)
	at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1034)
	at org.codehaus.groovy.runtime.callsite.PogoMetaClassSite.call(PogoMetaClassSite.java:41)
	at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:47)
	at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:116)
	at PluginClassLoader for script-security//org.kohsuke.groovy.sandbox.impl.Checker$1.call(Checker.java:180)
	at PluginClassLoader for script-security//org.kohsuke.groovy.sandbox.GroovyInterceptor.onMethodCall(GroovyInterceptor.java:23)
	at PluginClassLoader for script-security//org.jenkinsci.plugins.scriptsecurity.sandbox.groovy.SandboxInterceptor.onMethodCall(SandboxInterceptor.java:163)
	at PluginClassLoader for script-security//org.kohsuke.groovy.sandbox.impl.Checker$1.call(Checker.java:178)
	at PluginClassLoader for script-security//org.kohsuke.groovy.sandbox.impl.Checker.checkedCall(Checker.java:182)
	at PluginClassLoader for script-security//org.kohsuke.groovy.sandbox.impl.Checker.checkedCall(Checker.java:152)
	at PluginClassLoader for workflow-cps//com.cloudbees.groovy.cps.sandbox.SandboxInvoker.methodCall(SandboxInvoker.java:17)
	at PluginClassLoader for workflow-cps//org.jenkinsci.plugins.workflow.cps.LoggingInvoker.methodCall(LoggingInvoker.java:117)
Also:   org.jenkinsci.plugins.workflow.actions.ErrorAction$ErrorId: 7bf27986-f833-4690-b626-ac881cedac47
Caused: java.lang.IllegalArgumentException: Could not instantiate \{enabledForFailure=true, tools=[{parser=COBERTURA, pattern=TestResults\*OpenCover.xml}], qualityGates=[\{criticality=FAILURE, baseline=PROJECT, metric=LINE, threshold=85.00}, \{criticality=UNSTABLE, baseline=PROJECT_DELTA, metric=LINE, threshold=0.0}, \{criticality=FAILURE, baseline=PROJECT, metric=BRANCH, threshold=75.00}, \{criticality=UNSTABLE, baseline=PROJECT_DELTA, metric=BRANCH, threshold=0.0}, \{criticality=UNSTABLE, baseline=PROJECT, metric=COMPLEXITY_MAXIMUM, threshold=30.0}, \{criticality=UNSTABLE, baseline=PROJECT_DELTA, metric=COMPLEXITY_DENSITY, threshold=0.0}]} for io.jenkins.plugins.coverage.metrics.steps.CoverageStep
	at PluginClassLoader for structs//org.jenkinsci.plugins.structs.describable.DescribableModel.instantiate(DescribableModel.java:340)
	at PluginClassLoader for workflow-cps//org.jenkinsci.plugins.workflow.cps.DSL.invokeStep(DSL.java:306)
	at PluginClassLoader for workflow-cps//org.jenkinsci.plugins.workflow.cps.DSL.invokeMethod(DSL.java:196)
	at PluginClassLoader for workflow-cps//org.jenkinsci.plugins.workflow.cps.CpsScript.invokeMethod(CpsScript.java:124)
	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
	at java.base/java.lang.reflect.Method.invoke(Method.java:580)
	at org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:98)
	at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:325)
	at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1225)
	at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1034)
	at org.codehaus.groovy.runtime.callsite.PogoMetaClassSite.call(PogoMetaClassSite.java:41)
	at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:47)
	at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:116)
	at PluginClassLoader for script-security//org.kohsuke.groovy.sandbox.impl.Checker$1.call(Checker.java:180)
	at PluginClassLoader for script-security//org.kohsuke.groovy.sandbox.GroovyInterceptor.onMethodCall(GroovyInterceptor.java:23)
	at PluginClassLoader for script-security//org.jenkinsci.plugins.scriptsecurity.sandbox.groovy.SandboxInterceptor.onMethodCall(SandboxInterceptor.java:163)
	at PluginClassLoader for script-security//org.kohsuke.groovy.sandbox.impl.Checker$1.call(Checker.java:178)
	at PluginClassLoader for script-security//org.kohsuke.groovy.sandbox.impl.Checker.checkedCall(Checker.java:182)
	at PluginClassLoader for script-security//org.kohsuke.groovy.sandbox.impl.Checker.checkedCall(Checker.java:152)
	at PluginClassLoader for workflow-cps//com.cloudbees.groovy.cps.sandbox.SandboxInvoker.methodCall(SandboxInvoker.java:17)
	at PluginClassLoader for workflow-cps//org.jenkinsci.plugins.workflow.cps.LoggingInvoker.methodCall(LoggingInvoker.java:117)
	at WorkflowScript.run(WorkflowScript:136)
	at org.jenkinsci.plugins.pipeline.modeldefinition.ModelInterpreter.delegateAndExecute(ModelInterpreter.groovy:138)
	at org.jenkinsci.plugins.pipeline.modeldefinition.ModelInterpreter.runPostConditions(ModelInterpreter.groovy:768)
	at org.jenkinsci.plugins.pipeline.modeldefinition.ModelInterpreter.catchRequiredContextForNode(ModelInterpreter.groovy:402)
	at org.jenkinsci.plugins.pipeline.modeldefinition.ModelInterpreter.catchRequiredContextForNode(ModelInterpreter.groovy:400)
	at org.jenkinsci.plugins.pipeline.modeldefinition.ModelInterpreter.runPostConditions(ModelInterpreter.groovy:767)
	at com.cloudbees.groovy.cps.CpsDefaultGroovyMethods.each(CpsDefaultGroovyMethods:2125)
	at com.cloudbees.groovy.cps.CpsDefaultGroovyMethods.each(CpsDefaultGroovyMethods:2110)
	at com.cloudbees.groovy.cps.CpsDefaultGroovyMethods.each(CpsDefaultGroovyMethods:2151)
	at org.jenkinsci.plugins.pipeline.modeldefinition.ModelInterpreter.runPostConditions(ModelInterpreter.groovy:757)
	at org.jenkinsci.plugins.pipeline.modeldefinition.ModelInterpreter.runPostConditions(ModelInterpreter.groovy)
	at org.jenkinsci.plugins.pipeline.modeldefinition.ModelInterpreter.executePostBuild(ModelInterpreter.groovy:735)
	at ___cps.transform___(Native Method)
	at PluginClassLoader for workflow-cps//com.cloudbees.groovy.cps.impl.ContinuationGroup.methodCall(ContinuationGroup.java:90)
	at PluginClassLoader for workflow-cps//com.cloudbees.groovy.cps.impl.FunctionCallBlock$ContinuationImpl.dispatchOrArg(FunctionCallBlock.java:116)
	at PluginClassLoader for workflow-cps//com.cloudbees.groovy.cps.impl.FunctionCallBlock$ContinuationImpl.fixArg(FunctionCallBlock.java:85)
	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
	at java.base/java.lang.reflect.Method.invoke(Method.java:580)
	at PluginClassLoader for workflow-cps//com.cloudbees.groovy.cps.impl.ContinuationPtr$ContinuationImpl.receive(ContinuationPtr.java:72)
	at PluginClassLoader for workflow-cps//com.cloudbees.groovy.cps.impl.CollectionLiteralBlock$ContinuationImpl.dispatch(CollectionLiteralBlock.java:55)
	at PluginClassLoader for workflow-cps//com.cloudbees.groovy.cps.impl.CollectionLiteralBlock$ContinuationImpl.item(CollectionLiteralBlock.java:45)
	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
	at java.base/java.lang.reflect.Method.invoke(Method.java:580)
	at PluginClassLoader for workflow-cps//com.cloudbees.groovy.cps.impl.ContinuationPtr$ContinuationImpl.receive(ContinuationPtr.java:72)
	at PluginClassLoader for workflow-cps//com.cloudbees.groovy.cps.impl.CollectionLiteralBlock$ContinuationImpl.dispatch(CollectionLiteralBlock.java:55)
	at PluginClassLoader for workflow-cps//com.cloudbees.groovy.cps.impl.CollectionLiteralBlock$ContinuationImpl.item(CollectionLiteralBlock.java:45)
	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
	at java.base/java.lang.reflect.Method.invoke(Method.java:580)
	at PluginClassLoader for workflow-cps//com.cloudbees.groovy.cps.impl.ContinuationPtr$ContinuationImpl.receive(ContinuationPtr.java:72)
	at PluginClassLoader for workflow-cps//com.cloudbees.groovy.cps.impl.CollectionLiteralBlock$ContinuationImpl.dispatch(CollectionLiteralBlock.java:55)
	at PluginClassLoader for workflow-cps//com.cloudbees.groovy.cps.impl.CollectionLiteralBlock$ContinuationImpl.item(CollectionLiteralBlock.java:45)
	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
	at java.base/java.lang.reflect.Method.invoke(Method.java:580)
	at PluginClassLoader for workflow-cps//com.cloudbees.groovy.cps.impl.ContinuationPtr$ContinuationImpl.receive(ContinuationPtr.java:72)
	at PluginClassLoader for workflow-cps//com.cloudbees.groovy.cps.impl.ConstantBlock.eval(ConstantBlock.java:21)
	at PluginClassLoader for workflow-cps//com.cloudbees.groovy.cps.Next.step(Next.java:83)
	at PluginClassLoader for workflow-cps//com.cloudbees.groovy.cps.Continuable.run0(Continuable.java:147)
	at PluginClassLoader for workflow-cps//org.jenkinsci.plugins.workflow.cps.SandboxContinuable.access$001(SandboxContinuable.java:17)
	at PluginClassLoader for workflow-cps//org.jenkinsci.plugins.workflow.cps.SandboxContinuable.run0(SandboxContinuable.java:49)
	at PluginClassLoader for workflow-cps//org.jenkinsci.plugins.workflow.cps.CpsThread.runNextChunk(CpsThread.java:180)
	at PluginClassLoader for workflow-cps//org.jenkinsci.plugins.workflow.cps.CpsThreadGroup.run(CpsThreadGroup.java:422)
	at PluginClassLoader for workflow-cps//org.jenkinsci.plugins.workflow.cps.CpsThreadGroup$2.call(CpsThreadGroup.java:330)
	at PluginClassLoader for workflow-cps//org.jenkinsci.plugins.workflow.cps.CpsThreadGroup$2.call(CpsThreadGroup.java:294)
	at PluginClassLoader for workflow-cps//org.jenkinsci.plugins.workflow.cps.CpsVmExecutorService.lambda$wrap$4(CpsVmExecutorService.java:140)
	at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:317)
	at hudson.remoting.SingleLaneExecutorService$1.run(SingleLaneExecutorService.java:139)
	at jenkins.util.ContextResettingExecutorService$1.run(ContextResettingExecutorService.java:28)
	at jenkins.security.ImpersonatingExecutorService$1.run(ImpersonatingExecutorService.java:68)
	at jenkins.util.ErrorLoggingExecutorService.lambda$wrap$0(ErrorLoggingExecutorService.java:51)
	at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:572)
	at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:317)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1144)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:642)
	at PluginClassLoader for workflow-cps//org.jenkinsci.plugins.workflow.cps.CpsVmExecutorService$1.call(CpsVmExecutorService.java:53)
	at PluginClassLoader for workflow-cps//org.jenkinsci.plugins.workflow.cps.CpsVmExecutorService$1.call(CpsVmExecutorService.java:50)
	at org.codehaus.groovy.runtime.GroovyCategorySupport$ThreadCategoryInfo.use(GroovyCategorySupport.java:136)
	at org.codehaus.groovy.runtime.GroovyCategorySupport.use(GroovyCategorySupport.java:275)
	at PluginClassLoader for workflow-cps//org.jenkinsci.plugins.workflow.cps.CpsVmExecutorService.lambda$categoryThreadFactory$0(CpsVmExecutorService.java:50)
	at java.base/java.lang.Thread.run(Thread.java:1583)