| The declarative pipeline documentation on "post" says the following: "These condition blocks allow the execution of steps inside each condition depending on the completion status of the Pipeline or stage" Currently, the post execution of a stage seems to refer to the whole pipeline status at that point and not the completion status of the stage as documented. Given the following pipeline:
pipeline {
agent any
stages {
stage('First') {
steps { echo 'Hello' }
post { success { echo 'First stage is success' } }
}
stage('Second') {
steps { sh """ echo '<testsuite errors="1" failures="0" name="test" skipped="0" tests="1" time="1"><testcase classname="" file="file.txt" name="name" time="0.000"><error message="error"></error></testcase></testsuite>' > test-results.xml """ }
post {
always { junit 'test-results.xml' }
unstable { echo 'Second stage is unstable' }
}
}
stage('Third') {
steps { echo 'Hello' }
post {
success { echo 'Third stage is success' }
unstable { echo 'Third stage is unstable! really???' }
}
}
}
post { unstable { echo 'Job is unstable' } }
}
I get the following output:
[Pipeline] {
[Pipeline] stage
[Pipeline] { (First)
[Pipeline] echo
Hello
Post stage
[Pipeline] echo
First stage is success
[Pipeline] }
[Pipeline] // stage
[Pipeline] stage
[Pipeline] { (Second)
[Pipeline] sh
+ echo <testsuite errors="1" failures="0" name="test" skipped="0" tests="1" time="1"><testcase classname="" file="file.txt" name="name" time="0.000"><error message="error"></error></testcase></testsuite>
Post stage
[Pipeline] junit
Recording test results
[Pipeline] echo
Second stage is unstable
[Pipeline] }
[Pipeline] // stage
[Pipeline] stage
[Pipeline] { (Third)
[Pipeline] echo
Hello
Post stage
[Pipeline] echo
Third stage is unstable! really???
[Pipeline] }
[Pipeline] // stage
[Pipeline] stage
[Pipeline] { (Declarative: Post Actions)
[Pipeline] echo
Job is unstable
[Pipeline] }
[Pipeline] // stage
[Pipeline] }
[Pipeline] // node
[Pipeline] End of Pipeline
Clearly the third stage post unstable block is executed even though the stage itself is a success. This is also contradicted by the blue ocean stage view: 
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