One enhancement that might be nice, if possible, is to have the values for an axis name be supported as non-literals. I don't seem to be able to make this work in the current version. Sorry if this isn't the right place, but you were asking for examples above...

Example:

pipeline {
  environment {
     LOW_ERLANG_VER = '19.3.6.8'
     MID_ERLANG_VER = '20.3.8.24'
     HIGH_ERLANG_VER = '22.2'
{{  }}}

  stages {
    // ...
    // Other stages that need the values above
    // ...
    stage("Build") {
      matrix {
        axes {
          axis {
            name 'ERLANG_VERSION'
            values "{$env.LOW_ERLANG_VER}", "${env.MID_ERLANG_VER}", "${env.HIGH_ERLANG_VER}"
{{          }}}
        } // axes
        // ...
        // do the build with ${ERLANG_VERSION}
        // ...
      } // matrix
    } // stage
  } // stages
} // pipeline

if that makes sense.

wohali
This totally makes sense. An issue has been opened for it. https://issues.jenkins-ci.org/browse/JENKINS-61047

Matrix stages in declarative pipelines have already been implemented and documented: https://www.jenkins.io/doc/book/pipeline/syntax/#declarative-matrix

Can this issue be closed now, or is something still missing?

It seems the last matrix-specific change without a separate Jira issue was in pipeline-model-definition-1.6.0:

• Add support for matrix to the directive generator (#380)

So, I'd consider this issue resolved in that version. Please reopen if you disagree.