Metric 'files' should not be computed by a Sensor exception

[danirukun]

When running sonar-scanner on any Erlang project (OTP 21-23), I get the following error:

ERROR: Error during SonarScanner execution
java.lang.UnsupportedOperationException: Metric 'files' should not be computed by a Sensor
	at org.sonar.scanner.sensor.DefaultSensorStorage.saveMeasure(DefaultSensorStorage.java:168)
	at org.sonar.scanner.sensor.DefaultSensorStorage.store(DefaultSensorStorage.java:132)
	at org.sonar.api.batch.sensor.measure.internal.DefaultMeasure.doSave(DefaultMeasure.java:95)
	at org.sonar.api.batch.sensor.internal.DefaultStorable.save(DefaultStorable.java:45)
	at org.sonar.plugins.erlang.ErlangSquidSensor.saveMeasures(ErlangSquidSensor.java:131)
	at org.sonar.plugins.erlang.ErlangSquidSensor.save(ErlangSquidSensor.java:118)
	at org.sonar.plugins.erlang.ErlangSquidSensor.execute(ErlangSquidSensor.java:105)
	at org.sonar.scanner.sensor.AbstractSensorWrapper.analyse(AbstractSensorWrapper.java:48)
	at org.sonar.scanner.sensor.ModuleSensorsExecutor.execute(ModuleSensorsExecutor.java:85)
	at org.sonar.scanner.sensor.ModuleSensorsExecutor.lambda$execute$1(ModuleSensorsExecutor.java:59)
	at org.sonar.scanner.sensor.ModuleSensorsExecutor.withModuleStrategy(ModuleSensorsExecutor.java:77)
	at org.sonar.scanner.sensor.ModuleSensorsExecutor.execute(ModuleSensorsExecutor.java:59)
	at org.sonar.scanner.scan.ModuleScanContainer.doAfterStart(ModuleScanContainer.java:82)
	at org.sonar.core.platform.ComponentContainer.startComponents(ComponentContainer.java:136)
	at org.sonar.core.platform.ComponentContainer.execute(ComponentContainer.java:122)
	at org.sonar.scanner.scan.ProjectScanContainer.scan(ProjectScanContainer.java:400)
	at org.sonar.scanner.scan.ProjectScanContainer.scanRecursively(ProjectScanContainer.java:395)
	at org.sonar.scanner.scan.ProjectScanContainer.doAfterStart(ProjectScanContainer.java:358)
	at org.sonar.core.platform.ComponentContainer.startComponents(ComponentContainer.java:136)
	at org.sonar.core.platform.ComponentContainer.execute(ComponentContainer.java:122)
	at org.sonar.scanner.bootstrap.GlobalContainer.doAfterStart(GlobalContainer.java:141)
	at org.sonar.core.platform.ComponentContainer.startComponents(ComponentContainer.java:136)
	at org.sonar.core.platform.ComponentContainer.execute(ComponentContainer.java:122)
	at org.sonar.batch.bootstrapper.Batch.doExecute(Batch.java:73)
	at org.sonar.batch.bootstrapper.Batch.execute(Batch.java:67)
	at org.sonarsource.scanner.api.internal.batch.BatchIsolatedLauncher.execute(BatchIsolatedLauncher.java:46)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.sonarsource.scanner.api.internal.IsolatedLauncherProxy.invoke(IsolatedLauncherProxy.java:60)
	at com.sun.proxy.$Proxy0.execute(Unknown Source)
	at org.sonarsource.scanner.api.EmbeddedScanner.doExecute(EmbeddedScanner.java:189)
	at org.sonarsource.scanner.api.EmbeddedScanner.execute(EmbeddedScanner.java:138)
	at org.sonarsource.scanner.cli.Main.execute(Main.java:112)
	at org.sonarsource.scanner.cli.Main.execute(Main.java:75)
	at org.sonarsource.scanner.cli.Main.main(Main.java:61)

More debug info:

INFO: SonarScanner 4.4.0.2170
INFO: Java 1.8.0_202 Oracle Corporation (64-bit)
INFO: Mac OS X 10.15.6 x86_64

SonarQube server version : Community EditionVersion 7.9.4 (build 35981)

To reproduce:

1. Install sonar-scanner (on macOS with homebrew)
2. Run the following in some project root:

sonar-scanner -X
-Dsonar.projectKey=xxxx
-Dsonar.sources=src
-Dsonar.host.url=https://xxxx.com
-Dsonar.login=xxxx

3. Observe exception