diff --git a/.ci/pipeline-library/README.md b/.ci/pipeline-library/README.md
new file mode 100644
index 00000000000000..71d7c39e37f4fe
--- /dev/null
+++ b/.ci/pipeline-library/README.md
@@ -0,0 +1,8 @@
+# Kibana Jenkins Pipeline Library
+
+## Running tests
+
+```bash
+cd .ci/pipeline-library
+./gradlew test
+```
\ No newline at end of file
diff --git a/.ci/pipeline-library/build.gradle b/.ci/pipeline-library/build.gradle
new file mode 100644
index 00000000000000..2753750871ad59
--- /dev/null
+++ b/.ci/pipeline-library/build.gradle
@@ -0,0 +1,45 @@
+plugins {
+  id 'groovy'
+  id 'idea'
+}
+
+group = 'co.elastic.kibana.pipeline'
+version = '0.0.1'
+
+sourceCompatibility = 1.8
+targetCompatibility = 1.8
+
+repositories {
+  maven { url 'https://repo.jenkins-ci.org/releases/' }
+  maven { url 'https://repo.maven.apache.org/maven2' }
+}
+
+dependencies {
+  implementation 'org.codehaus.groovy:groovy-all:2.4.12'
+  implementation 'org.jenkins-ci.main:jenkins-core:2.23'
+  implementation 'org.jenkins-ci.plugins.workflow:workflow-step-api:2.19@jar'
+  testImplementation 'com.lesfurets:jenkins-pipeline-unit:1.4'
+  testImplementation 'junit:junit:4.12'
+  testImplementation 'org.assertj:assertj-core:3.15+' // Temporary https://github.com/jenkinsci/JenkinsPipelineUnit/issues/209
+}
+
+sourceSets {
+  main {
+    groovy {
+      srcDirs = ['vars']
+    }
+  }
+
+  test {
+    groovy {
+      srcDirs = ['src/test']
+    }
+  }
+}
+
+test {
+  testLogging {
+    events 'passed', 'skipped', 'failed'
+    exceptionFormat = 'full'
+  }
+}
diff --git a/.ci/pipeline-library/gradle/wrapper/gradle-wrapper.jar b/.ci/pipeline-library/gradle/wrapper/gradle-wrapper.jar
new file mode 100644
index 00000000000000..62d4c053550b91
Binary files /dev/null and b/.ci/pipeline-library/gradle/wrapper/gradle-wrapper.jar differ
diff --git a/.ci/pipeline-library/gradle/wrapper/gradle-wrapper.properties b/.ci/pipeline-library/gradle/wrapper/gradle-wrapper.properties
new file mode 100644
index 00000000000000..a4f0001d203b29
--- /dev/null
+++ b/.ci/pipeline-library/gradle/wrapper/gradle-wrapper.properties
@@ -0,0 +1,5 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.4.1-bin.zip
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
diff --git a/.ci/pipeline-library/gradlew b/.ci/pipeline-library/gradlew
new file mode 100755
index 00000000000000..fbd7c515832dab
--- /dev/null
+++ b/.ci/pipeline-library/gradlew
@@ -0,0 +1,185 @@
+#!/usr/bin/env sh
+
+#
+# Copyright 2015 the original author or authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+##############################################################################
+##
+##  Gradle start up script for UN*X
+##
+##############################################################################
+
+# Attempt to set APP_HOME
+# Resolve links: $0 may be a link
+PRG="$0"
+# Need this for relative symlinks.
+while [ -h "$PRG" ] ; do
+    ls=`ls -ld "$PRG"`
+    link=`expr "$ls" : '.*-> \(.*\)$'`
+    if expr "$link" : '/.*' > /dev/null; then
+        PRG="$link"
+    else
+        PRG=`dirname "$PRG"`"/$link"
+    fi
+done
+SAVED="`pwd`"
+cd "`dirname \"$PRG\"`/" >/dev/null
+APP_HOME="`pwd -P`"
+cd "$SAVED" >/dev/null
+
+APP_NAME="Gradle"
+APP_BASE_NAME=`basename "$0"`
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD="maximum"
+
+warn () {
+    echo "$*"
+}
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+}
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "`uname`" in
+  CYGWIN* )
+    cygwin=true
+    ;;
+  Darwin* )
+    darwin=true
+    ;;
+  MINGW* )
+    msys=true
+    ;;
+  NONSTOP* )
+    nonstop=true
+    ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD="$JAVA_HOME/jre/sh/java"
+    else
+        JAVACMD="$JAVA_HOME/bin/java"
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD="java"
+    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+fi
+
+# Increase the maximum file descriptors if we can.
+if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then
+    MAX_FD_LIMIT=`ulimit -H -n`
+    if [ $? -eq 0 ] ; then
+        if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
+            MAX_FD="$MAX_FD_LIMIT"
+        fi
+        ulimit -n $MAX_FD
+        if [ $? -ne 0 ] ; then
+            warn "Could not set maximum file descriptor limit: $MAX_FD"
+        fi
+    else
+        warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT"
+    fi
+fi
+
+# For Darwin, add options to specify how the application appears in the dock
+if $darwin; then
+    GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
+fi
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if [ "$cygwin" = "true" -o "$msys" = "true" ] ; then
+    APP_HOME=`cygpath --path --mixed "$APP_HOME"`
+    CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
+    
+    JAVACMD=`cygpath --unix "$JAVACMD"`
+
+    # We build the pattern for arguments to be converted via cygpath
+    ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
+    SEP=""
+    for dir in $ROOTDIRSRAW ; do
+        ROOTDIRS="$ROOTDIRS$SEP$dir"
+        SEP="|"
+    done
+    OURCYGPATTERN="(^($ROOTDIRS))"
+    # Add a user-defined pattern to the cygpath arguments
+    if [ "$GRADLE_CYGPATTERN" != "" ] ; then
+        OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
+    fi
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    i=0
+    for arg in "$@" ; do
+        CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -`
+        CHECK2=`echo "$arg"|egrep -c "^-"`                                 ### Determine if an option
+
+        if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then                    ### Added a condition
+            eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"`
+        else
+            eval `echo args$i`="\"$arg\""
+        fi
+        i=`expr $i + 1`
+    done
+    case $i in
+        0) set -- ;;
+        1) set -- "$args0" ;;
+        2) set -- "$args0" "$args1" ;;
+        3) set -- "$args0" "$args1" "$args2" ;;
+        4) set -- "$args0" "$args1" "$args2" "$args3" ;;
+        5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
+        6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
+        7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
+        8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
+        9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
+    esac
+fi
+
+# Escape application args
+save () {
+    for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done
+    echo " "
+}
+APP_ARGS=`save "$@"`
+
+# Collect all arguments for the java command, following the shell quoting and substitution rules
+eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS"
+
+exec "$JAVACMD" "$@"
diff --git a/.ci/pipeline-library/gradlew.bat b/.ci/pipeline-library/gradlew.bat
new file mode 100644
index 00000000000000..a9f778a7a964b6
--- /dev/null
+++ b/.ci/pipeline-library/gradlew.bat
@@ -0,0 +1,104 @@
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+
+@if "%DEBUG%" == "" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%" == "" set DIRNAME=.
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if "%ERRORLEVEL%" == "0" goto init
+
+echo.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto init
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:init
+@rem Get command-line arguments, handling Windows variants
+
+if not "%OS%" == "Windows_NT" goto win9xME_args
+
+:win9xME_args
+@rem Slurp the command line arguments.
+set CMD_LINE_ARGS=
+set _SKIP=2
+
+:win9xME_args_slurp
+if "x%~1" == "x" goto execute
+
+set CMD_LINE_ARGS=%*
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %CMD_LINE_ARGS%
+
+:end
+@rem End local scope for the variables with windows NT shell
+if "%ERRORLEVEL%"=="0" goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+if  not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
+exit /b 1
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega
diff --git a/.ci/pipeline-library/src/test/KibanaBasePipelineTest.groovy b/.ci/pipeline-library/src/test/KibanaBasePipelineTest.groovy
new file mode 100644
index 00000000000000..23282089ab76c2
--- /dev/null
+++ b/.ci/pipeline-library/src/test/KibanaBasePipelineTest.groovy
@@ -0,0 +1,106 @@
+import com.lesfurets.jenkins.unit.*
+import org.junit.Before
+
+class KibanaBasePipelineTest extends BasePipelineTest {
+  Map env = [:]
+  Map params = [:]
+
+  public def Mocks = [
+    TEST_FAILURE_URL: 'https://localhost/',
+    TEST_FAILURE_NAME: 'Kibana Pipeline / kibana-xpack-agent / Chrome X-Pack UI Functional Tests.x-pack/test/functional/apps/fake/test·ts.Fake test <Component> should & pass &',
+  ]
+
+  @Before
+  void setUp() {
+    super.setUp()
+
+    env.BRANCH_NAME = 'master'
+    env.BUILD_ID = '1'
+    env.BUILD_DISPLAY_NAME = "#${env.BUILD_ID}"
+
+    env.JENKINS_URL = 'http://jenkins.localhost:8080'
+    env.BUILD_URL = "${env.JENKINS_URL}/job/elastic+kibana+${env.BRANCH_NAME}/${env.BUILD_ID}/"
+
+    env.JOB_BASE_NAME = "elastic / kibana # ${env.BRANCH_NAME}"
+    env.JOB_NAME = env.JOB_BASE_NAME
+
+    env.WORKSPACE = 'WS'
+
+    props([
+      buildUtils: [
+        getBuildStatus: { 'SUCCESS' },
+        printStacktrace: { ex -> print ex },
+      ],
+      jenkinsApi: [ getFailedSteps: { [] } ],
+      testUtils: [ getFailures: { [] } ],
+    ])
+
+    vars([
+      env: env,
+      params: params,
+    ])
+
+    // Some wrappers that can just be mocked to immediately call the closure passed in
+    [
+      'catchError',
+      'catchErrors',
+      'timestamps',
+      'withGithubCredentials',
+    ].each {
+      helper.registerAllowedMethod(it, [Closure.class], null)
+    }
+  }
+
+  void props(Map properties) {
+    properties.each {
+      binding.setProperty(it.key, it.value)
+    }
+  }
+
+  void prop(String propertyName, Object propertyValue) {
+    binding.setProperty(propertyName, propertyValue)
+  }
+
+  void vars(Map variables) {
+    variables.each {
+      binding.setVariable(it.key, it.value)
+    }
+  }
+
+  void var(String variableName, Object variableValue) {
+    binding.setVariable(variableName, variableValue)
+  }
+
+  def fnMock(String name) {
+    return helper.callStack.find { it.methodName == name }
+  }
+
+  void mockFailureBuild() {
+    props([
+      buildUtils: [
+        getBuildStatus: { 'FAILURE' },
+        printStacktrace: { ex -> print ex },
+      ],
+      jenkinsApi: [ getFailedSteps: { [
+        [
+          displayName: 'Check out from version control',
+          logs: 'http://jenkins.localhost:8080',
+        ],
+        [
+          displayName: 'Execute test task',
+          logs: 'http://jenkins.localhost:8080',
+        ],
+      ] } ],
+      testUtils: [
+        getFailures: {
+          return [
+            [
+              url: Mocks.TEST_FAILURE_URL,
+              fullDisplayName: Mocks.TEST_FAILURE_NAME,
+            ]
+          ]
+        },
+      ],
+    ])
+  }
+}
diff --git a/.ci/pipeline-library/src/test/prChanges.groovy b/.ci/pipeline-library/src/test/prChanges.groovy
new file mode 100644
index 00000000000000..0fb750d6ff64e1
--- /dev/null
+++ b/.ci/pipeline-library/src/test/prChanges.groovy
@@ -0,0 +1,87 @@
+import org.junit.*
+import static groovy.test.GroovyAssert.*
+
+class PrChangesTest extends KibanaBasePipelineTest {
+  def prChanges
+
+  @Before
+  void setUp() {
+    super.setUp()
+
+    env.ghprbPullId = '1'
+
+    props([
+      githubPr: [
+        isPr: { true },
+      ],
+    ])
+
+    prChanges = loadScript("vars/prChanges.groovy")
+  }
+
+  @Test
+  void 'areChangesSkippable() with no changes'() {
+    props([
+      githubPrs: [
+        getChanges: { [] },
+      ],
+    ])
+
+    assertTrue(prChanges.areChangesSkippable())
+  }
+
+  @Test
+  void 'areChangesSkippable() with skippable changes'() {
+    props([
+      githubPrs: [
+        getChanges: { [
+          [filename: 'docs/test/a-fake-doc.asciidoc'],
+          [filename: 'README.md'],
+        ] },
+      ],
+    ])
+
+    assertTrue(prChanges.areChangesSkippable())
+  }
+
+  @Test
+  void 'areChangesSkippable() with skippable renames'() {
+    props([
+      githubPrs: [
+        getChanges: { [
+          [ filename: 'docs/test/a-fake-doc.asciidoc', previousFilename: 'docs/test/a-different-fake-doc.asciidoc' ],
+          [ filename: 'README.md', previousFilename: 'README-old.md' ],
+        ] },
+      ],
+    ])
+
+    assertTrue(prChanges.areChangesSkippable())
+  }
+
+  @Test
+  void 'areChangesSkippable() with unskippable changes'() {
+    props([
+      githubPrs: [
+        getChanges: { [
+          [filename: 'src/core/index.ts'],
+        ] },
+      ],
+    ])
+
+    assertFalse(prChanges.areChangesSkippable())
+  }
+
+  @Test
+  void 'areChangesSkippable() with skippable and unskippable changes'() {
+    props([
+      githubPrs: [
+        getChanges: { [
+          [filename: 'README.md'],
+          [filename: 'src/core/index.ts'],
+        ] },
+      ],
+    ])
+
+    assertFalse(prChanges.areChangesSkippable())
+  }
+}
diff --git a/.ci/pipeline-library/src/test/slackNotifications.groovy b/.ci/pipeline-library/src/test/slackNotifications.groovy
new file mode 100644
index 00000000000000..467e4a0e5f520f
--- /dev/null
+++ b/.ci/pipeline-library/src/test/slackNotifications.groovy
@@ -0,0 +1,62 @@
+import org.junit.*
+import static groovy.test.GroovyAssert.*
+
+class SlackNotificationsTest extends KibanaBasePipelineTest {
+  def slackNotifications
+
+  @Before
+  void setUp() {
+    super.setUp()
+
+    helper.registerAllowedMethod('slackSend', [Map.class], null)
+    slackNotifications = loadScript('vars/slackNotifications.groovy')
+  }
+
+  @Test
+  void 'getTestFailures() should properly format failure steps'() {
+    mockFailureBuild()
+
+    def failureMessage = slackNotifications.getTestFailures()
+
+    assertEquals(
+      "*Test Failures*\n• <${Mocks.TEST_FAILURE_URL}|x-pack/test/functional/apps/fake/test·ts.Fake test &lt;Component&gt; should &amp; pass &amp;>",
+      failureMessage
+    )
+  }
+
+  @Test
+  void 'sendFailedBuild() should call slackSend() with message'() {
+    mockFailureBuild()
+
+    slackNotifications.sendFailedBuild()
+
+    def args = fnMock('slackSend').args[0]
+
+    def expected = [
+      channel: '#kibana-operations-alerts',
+      username: 'Kibana Operations',
+      iconEmoji: ':jenkins:',
+      color: 'danger',
+      message: ':broken_heart: elastic / kibana # master #1',
+    ]
+
+    expected.each {
+      assertEquals(it.value.toString(), args[it.key].toString())
+    }
+
+    assertEquals(
+      ":broken_heart: *<http://jenkins.localhost:8080/job/elastic+kibana+master/1/|elastic / kibana # master #1>*",
+      args.blocks[0].text.text.toString()
+    )
+
+    assertEquals(
+      "*Failed Steps*\n• <http://jenkins.localhost:8080|Execute test task>",
+      args.blocks[1].text.text.toString()
+    )
+
+    assertEquals(
+      "*Test Failures*\n• <https://localhost/|x-pack/test/functional/apps/fake/test·ts.Fake test &lt;Component&gt; should &amp; pass &amp;>",
+      args.blocks[2].text.text.toString()
+    )
+  }
+}
diff --git a/.ci/pipeline-library/vars b/.ci/pipeline-library/vars
new file mode 120000
index 00000000000000..8559d2e08fc22c
--- /dev/null
+++ b/.ci/pipeline-library/vars
@@ -0,0 +1 @@
+../../vars
\ No newline at end of file
diff --git a/.gitignore b/.gitignore
index 13c7cd5fb2769d..3e12be36c5fb87 100644
--- a/.gitignore
+++ b/.gitignore
@@ -47,3 +47,5 @@ npm-debug.log*
 x-pack/plugins/apm/tsconfig.json
 apm.tsconfig.json
 /x-pack/plugins/apm/e2e/snapshots.js
+.ci/pipeline-library/build/
+.gradle
diff --git a/src/dev/precommit_hook/casing_check_config.js b/src/dev/precommit_hook/casing_check_config.js
index 601dcc86352a76..472d2d814f28dd 100644
--- a/src/dev/precommit_hook/casing_check_config.js
+++ b/src/dev/precommit_hook/casing_check_config.js
@@ -46,6 +46,7 @@ export const IGNORE_FILE_GLOBS = [
   '**/Jenkinsfile*',
   'Dockerfile*',
   'vars/*',
+  '.ci/pipeline-library/**/*',
 
   // Files in this directory must match a pre-determined name in some cases.
   'x-pack/plugins/canvas/.storybook/*',
diff --git a/vars/kibanaPipeline.groovy b/vars/kibanaPipeline.groovy
index 130e72a5bdea97..76da8ec6dd9ab1 100644
--- a/vars/kibanaPipeline.groovy
+++ b/vars/kibanaPipeline.groovy
@@ -204,6 +204,8 @@ def call(Map params = [:], Closure closure) {
       timestamps {
         ansiColor('xterm') {
           if (config.checkPrChanges && githubPr.isPr()) {
+            pipelineLibraryTests()
+
             print "Checking PR for changes to determine if CI needs to be run..."
 
             if (prChanges.areChangesSkippable()) {
@@ -218,5 +220,15 @@ def call(Map params = [:], Closure closure) {
   }
 }
 
+def pipelineLibraryTests() {
+  whenChanged(['vars/', '.ci/pipeline-library/']) {
+    workers.base(size: 'flyweight', bootstrapped: false, ramDisk: false) {
+      dir('.ci/pipeline-library') {
+        sh './gradlew test'
+      }
+    }
+  }
+}
+
 
 return this
diff --git a/vars/prChanges.groovy b/vars/prChanges.groovy
index 4b9b20a945f762..414e6511772770 100644
--- a/vars/prChanges.groovy
+++ b/vars/prChanges.groovy
@@ -1,6 +1,6 @@
 import groovy.transform.Field
 
-public static @Field PR_CHANGES_CACHE = null
+public static @Field PR_CHANGES_CACHE = []
 
 def getSkippablePaths() {
   return [
@@ -8,6 +8,7 @@ def getSkippablePaths() {
     /^rfcs\//,
     /^.ci\/.+\.yml$/,
     /^.ci\/es-snapshots\//,
+    /^.ci\/pipeline-library\//,
     /^\.github\//,
     /\.md$/,
   ]
@@ -42,7 +43,10 @@ def areChangesSkippable() {
 def getChanges() {
   if (!PR_CHANGES_CACHE && env.ghprbPullId) {
     withGithubCredentials {
-      PR_CHANGES_CACHE = githubPrs.getChanges(env.ghprbPullId)
+      def changes = githubPrs.getChanges(env.ghprbPullId)
+      if (changes) {
+        PR_CHANGES_CACHE.addAll(changes)
+      }
     }
   }
 
diff --git a/vars/slackNotifications.groovy b/vars/slackNotifications.groovy
index c50a99d3e335c5..2ffb420ecf3f4f 100644
--- a/vars/slackNotifications.groovy
+++ b/vars/slackNotifications.groovy
@@ -62,7 +62,17 @@ def getTestFailures() {
   def messages = []
   messages << "*Test Failures*"
 
-  def list = failures.collect { "• <${it.url}|${it.fullDisplayName.split(/\./, 2)[-1]}>" }.join("\n")
+  def list = failures.collect {
+    def name = it
+      .fullDisplayName
+      .split(/\./, 2)[-1]
+      // Only the following three characters need to be escaped for link text, per Slack's docs
+      .replaceAll('&', '&amp;')
+      .replaceAll('<', '&lt;')
+      .replaceAll('>', '&gt;')
+
+    return "• <${it.url}|${name}>"
+  }.join("\n")
   return "*Test Failures*\n${list}"
 }
 
@@ -100,6 +110,7 @@ def sendFailedBuild(Map params = [:]) {
   ] + params
 
   def title = "${getStatusIcon()} ${config.title}"
+  def message = "${getStatusIcon()} ${config.message}"
 
   def blocks = [markdownBlock(title)]
   getFailedBuildBlocks().each { blocks << it }
@@ -111,7 +122,7 @@ def sendFailedBuild(Map params = [:]) {
     username: config.username,
     iconEmoji: config.icon,
     color: config.color,
-    message: config.message,
+    message: message,
     blocks: blocks
   )
 }
diff --git a/vars/workers.groovy b/vars/workers.groovy
index 387f62a625230f..8034a548285a41 100644
--- a/vars/workers.groovy
+++ b/vars/workers.groovy
@@ -3,6 +3,8 @@
 
 def label(size) {
   switch(size) {
+    case 'flyweight':
+      return 'flyweight'
     case 's':
       return 'linux && immutable'
     case 's-highmem':