I have jenkins working fine with the anchore scanner plugin for both freestyle jobs and pipelines.

I created a multi-configuration project and the plugin is able to contact the anchore API as expected and queue the image, the image is scanned and we get a pass/fail evaluation back, and then the build fails when it gets to "Archiving artificats"

I think this is due to the fact that the matrix builds have a comma that separates the "coordinates" (I'm not sure what the terminology is here).

First, I noticed that if I only use one axis in the matrix, everything works.

EG simple reproducer:

1. create new multiconfiguration project.
2. add axis, call it AXIS1 and add values "alpha" and "beta"
3. add build step, "execute shell" with the following shell instruction:
   echo "docker.io/alpine:latest" > anchore_images
4. add build step, anchore container image scanner, leave everything as default
5. build now, everything works.

now, go back and configure the job again to add a 2nd axis.

1. add axis called "AXIS2" with value "red" (really only need one value in each axis)
2. build now, everything fails.
3. console output:

2020-11-17T18:09:49.611 INFO AnchoreWorker Anchore Container Image Scanner Plugin step result - PASS
2020-11-17T18:09:49.612 INFO AnchoreWorker Querying vulnerability listing for docker.io/alpine:latest
Archiving artifacts
‘AnchoreReport.alpha’ doesn’t match anything
2020-11-17T18:09:49.672 ERROR AnchoreWorker Failed to setup build results due to an unexpected error
hudson.AbortException: No artifacts found that match the file pattern "AnchoreReport.alpha,red_2/". Configuration error?
at hudson.tasks.ArtifactArchiver.perform(ArtifactArchiver.java:280)
at jenkins.tasks.SimpleBuildStep.perform(SimpleBuildStep.java:91)
at com.anchore.jenkins.plugins.anchore.BuildWorker.setupBuildReports(BuildWorker.java:740)
at com.anchore.jenkins.plugins.anchore.AnchoreBuilder.perform(AnchoreBuilder.java:255)
at jenkins.tasks.SimpleBuildStep.perform(SimpleBuildStep.java:112)
at hudson.tasks.BuildStepCompatibilityLayer.perform(BuildStepCompatibilityLayer.java:78)
at hudson.tasks.BuildStepMonitor$1.perform(BuildStepMonitor.java:20)
at hudson.model.AbstractBuild$AbstractBuildExecution.perform(AbstractBuild.java:741)
at hudson.model.Build$BuildExecution.build(Build.java:206)
at hudson.model.Build$BuildExecution.doRun(Build.java:163)
at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:504)
at hudson.model.Run.execute(Run.java:1894)
at hudson.matrix.MatrixRun.run(MatrixRun.java:153)
at hudson.model.ResourceController.execute(ResourceController.java:97)
at hudson.model.Executor.run(Executor.java:428)
2020-11-17T18:09:49.672 ERROR AnchorePlugin Failing Anchore Container Image Scanner Plugin step due to errors in plugin execution
hudson.AbortException: Failed to setup build results due to an unexpected error. Please refer to above logs for more information
at com.anchore.jenkins.plugins.anchore.BuildWorker.setupBuildReports(BuildWorker.java:761)
at com.anchore.jenkins.plugins.anchore.AnchoreBuilder.perform(AnchoreBuilder.java:255)
at jenkins.tasks.SimpleBuildStep.perform(SimpleBuildStep.java:112)
at hudson.tasks.BuildStepCompatibilityLayer.perform(BuildStepCompatibilityLayer.java:78)
at hudson.tasks.BuildStepMonitor$1.perform(BuildStepMonitor.java:20)
at hudson.model.AbstractBuild$AbstractBuildExecution.perform(AbstractBuild.java:741)
at hudson.model.Build$BuildExecution.build(Build.java:206)
at hudson.model.Build$BuildExecution.doRun(Build.java:163)
at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:504)
at hudson.model.Run.execute(Run.java:1894)
at hudson.matrix.MatrixRun.run(MatrixRun.java:153)
at hudson.model.ResourceController.execute(ResourceController.java:97)
at hudson.model.Executor.run(Executor.java:428)
2020-11-17T18:09:49.673 INFO AnchorePlugin Completed Anchore Container Image Scanner step
ERROR: Failed to setup build results due to an unexpected error. Please refer to above logs for more information
Finished: FAILURE
 
for the first build, with a single axis, the AnchoreReport is archived in /var/jenkins_home/jobs/matrix-repro1/configurations/axis-AXIS1/alpha/builds/1/archive/AnchoreReport.alpha_1 (and likewise for "beta")
 
bash-5.0$ cd /var/jenkins_home/jobs/matrix-repro1
bash-5.0$ find . -print | grep AnchoreReport
./configurations/axis-AXIS1/alpha/builds/1/archive/AnchoreReport.alpha_1
./configurations/axis-AXIS1/alpha/builds/1/archive/AnchoreReport.alpha_1/anchore_gates.json
./configurations/axis-AXIS1/alpha/builds/1/archive/AnchoreReport.alpha_1/anchoreengine-api-response-vulnerabilities-1.json
./configurations/axis-AXIS1/alpha/builds/1/archive/AnchoreReport.alpha_1/anchoreengine-api-response-evaluation-1.json
./configurations/axis-AXIS1/alpha/builds/1/archive/AnchoreReport.alpha_1/anchore_security.json
./configurations/axis-AXIS1/beta/builds/1/archive/AnchoreReport.beta_1
./configurations/axis-AXIS1/beta/builds/1/archive/AnchoreReport.beta_1/anchore_gates.json
./configurations/axis-AXIS1/beta/builds/1/archive/AnchoreReport.beta_1/anchoreengine-api-response-evaluation-1.json
./configurations/axis-AXIS1/beta/builds/1/archive/AnchoreReport.beta_1/anchoreengine-api-response-vulnerabilities-1.json
./configurations/axis-AXIS1/beta/builds/1/archive/AnchoreReport.beta_1/anchore_security.json
 
for the second build with two axes, I look in /var/jenkins_home/jobs/matrix-repro1/configurations/axis-AXIS1/alpha/axis-AXIS2/red/builds/2 but there's no "archive" directory there which is where I would expect the report to be stored.