....
checkout(
  scm: [
    $class: 'GitSCM',
    branches: [[name: "${GERRIT_BRANCH}"]],
    extensions: [
      [$class: 'CleanCheckout'],
      [$class: 'BuildChooserSetting', buildChooser: [$class: 'GerritTriggerBuildChooser']],
      [$class: 'WipeWorkspace']
    ],
    userRemoteConfigs: [[
      credentialsId: "ci-gerrit",
      name: 'gerrit',
      url: "ssh://${GERRIT_NAME}@${GERRIT_HOST}:${GERRIT_PORT}/${GERRIT_PROJECT}.git",
      refspec: "${GERRIT_REFSPEC}"
    ]]
  ]
)
....

Wiping out workspace first.
Cloning the remote Git repository
Cloning repository ssh://gerrit@gerrit_host:29418/project.git
 > git init /home/jenkins/workspace//project # timeout=10
Fetching upstream changes from ssh://gerrit@gerrit_host:29418/project.git
 > git --version # timeout=10
using GIT_SSH to set credentials credentials for Jenkins to Gerrit ssh connectivity

 > git fetch --tags --progress ssh://gerrit@gerrit_host:29418/project.git +refs/heads/*:refs/remotes/gerrit/*
ERROR: Error cloning remote repo 'gerrit'
hudson.plugins.git.GitException: Command "git fetch --tags --progress ssh://gerrit@gerrit_host:29418/project.git +refs/heads/*:refs/remotes/gerrit/*" returned status code 128:
stdout: 
stderr: /tmp/ssh5702738799948889518.sh: line 6: ssh: not found
fatal: Could not read from remote repository.

Please make sure you have the correct access rights
and the repository exists.

	at org.jenkinsci.plugins.gitclient.CliGitAPIImpl.launchCommandIn(CliGitAPIImpl.java:1752)
	at org.jenkinsci.plugins.gitclient.CliGitAPIImpl.launchCommandWithCredentials(CliGitAPIImpl.java:1495)
	at org.jenkinsci.plugins.gitclient.CliGitAPIImpl.access$300(CliGitAPIImpl.java:64)
	at org.jenkinsci.plugins.gitclient.CliGitAPIImpl$1.execute(CliGitAPIImpl.java:315)
	at org.jenkinsci.plugins.gitclient.CliGitAPIImpl$2.execute(CliGitAPIImpl.java:507)
	at org.jenkinsci.plugins.gitclient.RemoteGitImpl$CommandInvocationHandler$1.call(RemoteGitImpl.java:152)
	at org.jenkinsci.plugins.gitclient.RemoteGitImpl$CommandInvocationHandler$1.call(RemoteGitImpl.java:145)
	at hudson.remoting.UserRequest.perform(UserRequest.java:153)
	at hudson.remoting.UserRequest.perform(UserRequest.java:50)
	at hudson.remoting.Request$2.run(Request.java:332)
	at hudson.remoting.InterceptingExecutorService$1.call(InterceptingExecutorService.java:68)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at hudson.remoting.Engine$1$1.run(Engine.java:88)
	at java.lang.Thread.run(Thread.java:745)
	at ......remote call to kubernetes-8cd5b89b87c84a87b17fddc3652f1bd2-112fb0f32e8309(Native Method)
	at hudson.remoting.Channel.attachCallSiteStackTrace(Channel.java:1416)
	at hudson.remoting.UserResponse.retrieve(UserRequest.java:253)
	at hudson.remoting.Channel.call(Channel.java:781)
	at org.jenkinsci.plugins.gitclient.RemoteGitImpl$CommandInvocationHandler.execute(RemoteGitImpl.java:145)
	at sun.reflect.GeneratedMethodAccessor368.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.jenkinsci.plugins.gitclient.RemoteGitImpl$CommandInvocationHandler.invoke(RemoteGitImpl.java:131)
	at com.sun.proxy.$Proxy79.execute(Unknown Source)
	at hudson.plugins.git.GitSCM.retrieveChanges(GitSCM.java:1042)
	at hudson.plugins.git.GitSCM.checkout(GitSCM.java:1082)
	at org.jenkinsci.plugins.workflow.steps.scm.SCMStep.checkout(SCMStep.java:109)
	at org.jenkinsci.plugins.workflow.steps.scm.SCMStep$StepExecutionImpl.run(SCMStep.java:83)
	at org.jenkinsci.plugins.workflow.steps.scm.SCMStep$StepExecutionImpl.run(SCMStep.java:73)
	at org.jenkinsci.plugins.workflow.steps.AbstractSynchronousNonBlockingStepExecution$1$1.call(AbstractSynchronousNonBlockingStepExecution.java:52)
	at hudson.security.ACL.impersonate(ACL.java:213)
	at org.jenkinsci.plugins.workflow.steps.AbstractSynchronousNonBlockingStepExecution$1.run(AbstractSynchronousNonBlockingStepExecution.java:49)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at java.lang.Thread.run(Thread.java:745)
[Pipeline] }
[Pipeline] // stage
[Pipeline] echo
Failed: hudson.AbortException

 sh 'ssh -v'

# # + ssh -v
usage: ssh [-1246AaCfgKkMNnqsTtVvXxYy] [-b bind_address] [-c cipher_spec]
           [-D [bind_address:]port] [-E log_file] [-e escape_char]
           [-F configfile] [-I pkcs11] [-i identity_file]
           [-L [bind_address:]port:host:hostport] [-l login_name] [-m mac_spec]
           [-O ctl_cmd] [-o option] [-p port]
           [-Q cipher | cipher-auth | mac | kex | key]
           [-R [bind_address:]port:host:hostport] [-S ctl_path] [-W host:port]
           [-w local_tun[:remote_tun]] [user@]hostname [command]
[Pipeline] }
[Pipeline] // stage