diff --git a/src/com/mirantis/mk/Common.groovy b/src/com/mirantis/mk/Common.groovy
index 5027041..448935f 100644
--- a/src/com/mirantis/mk/Common.groovy
+++ b/src/com/mirantis/mk/Common.groovy
@@ -3,6 +3,8 @@
 import static groovy.json.JsonOutput.prettyPrint
 import static groovy.json.JsonOutput.toJson
 
+import groovy.time.TimeCategory
+
 import com.cloudbees.groovy.cps.NonCPS
 import groovy.json.JsonSlurperClassic
 
@@ -25,6 +27,31 @@
 }
 
 /**
+ * Return Duration for given datetime period with suffix
+ *
+ * @param input String in format '\d+[smhd]', to convert given number into seconds, minutes, hours
+ *              and days duration respectively. For example: '7d' is for 7 days, '10m' - 10 minutes
+ *              and so on. Return null if input in incorrect format
+ */
+def getDuration(String input) {
+    // Verify input format
+    if (!input.matches('[0-9]+[smhd]')) {
+        errorMsg("Incorrect input data for getDuration(): ${input}")
+        return
+    }
+    switch (input[-1]) {
+        case 's':
+            return TimeCategory.getSeconds(input[0..-2].toInteger())
+        case 'm':
+            return TimeCategory.getMinutes(input[0..-2].toInteger())
+        case 'h':
+            return TimeCategory.getHours(input[0..-2].toInteger())
+        case 'd':
+            return TimeCategory.getDays(input[0..-2].toInteger())
+    }
+}
+
+/**
  * Return workspace.
  * Currently implemented by calling pwd so it won't return relevant result in
  * dir context
diff --git a/src/com/mirantis/mk/Gerrit.groovy b/src/com/mirantis/mk/Gerrit.groovy
index 88da957..07c6b5d 100644
--- a/src/com/mirantis/mk/Gerrit.groovy
+++ b/src/com/mirantis/mk/Gerrit.groovy
@@ -320,11 +320,13 @@
  *                          HOST, PORT and USER
  * @param changeParams      Parameters to identify Geriit change e.g.: owner, topic,
  *                          status, branch, project
+ * @param extraFlags        Additional flags for gerrit querry for example
+ *                          '--current-patch-set' or '--comments' as a simple string
  */
-def findGerritChange(credentialsId, LinkedHashMap gerritAuth, LinkedHashMap changeParams) {
+def findGerritChange(credentialsId, LinkedHashMap gerritAuth, LinkedHashMap changeParams, String extraFlags = '') {
     scriptText = """
                  ssh -p ${gerritAuth['PORT']} ${gerritAuth['USER']}@${gerritAuth['HOST']} \
-                 gerrit query \
+                 gerrit query ${extraFlags} \
                  --format JSON \
                  """
     changeParams.each {
diff --git a/src/com/mirantis/mk/Ruby.groovy b/src/com/mirantis/mk/Ruby.groovy
index 4681d07..2e1e494 100644
--- a/src/com/mirantis/mk/Ruby.groovy
+++ b/src/com/mirantis/mk/Ruby.groovy
@@ -6,9 +6,9 @@
 
 /**
  * Ensures Ruby environment with given version (install it if necessary)
- * @param rubyVersion target ruby version (optional, default 2.2.3)
+ * @param rubyVersion target ruby version (optional, default 2.6.6)
  */
-def ensureRubyEnv(rubyVersion="2.4.1"){
+def ensureRubyEnv(rubyVersion="2.6.6"){
     if (!fileExists("/var/lib/jenkins/.rbenv/versions/${rubyVersion}/bin/ruby")){
         //XXX: patch ruby-build because debian package is quite old
         sh "git clone https://github.com/rbenv/ruby-build.git ~/.rbenv/plugins/ruby-build || git -C ~/.rbenv/plugins/ruby-build pull origin master"