MacBook-Pro:~ sunyifeng$ brew search jenkins
==> Searching local taps...
jenkins                           jenkins-job-builder               jenkins-lts
==> Searching taps on GitHub...
caskroom/cask/jenkins-menu
==> Searching blacklisted, migrated and deleted formulae...

If you meant "jenkins" specifically:
It was migrated from caskroom/cask to homebrew/core.
MacBook-Pro:~ sunyifeng$ brew install jenkins
Updating Homebrew...
==> Auto-updated Homebrew!
Updated 3 taps (homebrew/core, pivotal/tap, caskroom/cask).
==> New Formulae
annie               gitlab-gem          jsonrpc-glib        patchelf            tox
apache-arrow-glib   gr-osmosdr          libdazzle           phplint             trezor-agent
aws-es-proxy        hcloud              mkl-dnn             ssh-permit-a38      util-linux
cquery              jrtplib             netdata             template-glib
==> Updated Formulae
libtiff ✔                         gdk-pixbuf                        ocrmypdf
pivotal/tap/springboot ✔          geckodriver                       odpi
sqlite ✔                          gedit                             offlineimap
tomcat ✔                          gegl                              open-scene-graph
vim ✔                             getmail                           openimageio
abcmidi                           ghostscript                       openssh
abnfgen                           gist                              openttd
abyss                             git                               openvdb
afsctool                          git-annex                         optipng
agda                              git-sizer                         osm2pgrouting
allegro                           git-town                          osquery
amqp-cpp                          gitbucket                         packmol
angular-cli                       gitfs                             paket
apache-geode                      gitg                              pam_yubico
apibuilder-cli                    gitless                           pango
apktool                           gjs                               passenger
arangodb                          glade                             pcb
armor                             glib                              pdal
artifactory                       globus-toolkit                    percona-server-mongodb
asciinema                         gnome-builder                     perl@5.18
asio                              gnupg                             pgcli
aspectj                           go-jira                           pgroonga
at-spi2-atk                       go@1.9                            php
at-spi2-core                      gobject-introspection             php@5.6
atk                               goenv                             php@7.1
aws-sdk-cpp                       gollum                            phpunit
awscli                            google-benchmark                  picard-tools
azure-cli                         grails                            pick
babeld                            graphene                          pioneers
babl                              gron                              pipenv
bazel                             groonga                           pivotal/tap/gemfire
bcftools                          grpc                              pivotal/tap/pivnet-cli
bcpp                              gsoap                             pivotal/tap/tcserver
bedops                            gst-plugins-good                  plantuml
bettercap                         gtksourceview3                    poco
bibtex2html                       handbrake                         postgis
binaryen                          haproxy                           pqiv
bit                               harfbuzz                          presto
bitcoin                           heroku                            proguard
bitrise                           htmldoc                           proj
botan                             htop                              pstoedit
braid                             htslib                            pugixml
brotli                            hugo                              py2cairo
byteman                           i2p                               py3cairo
c14-cli                           imlib2                            pycodestyle
calicoctl                         influxdb                          qd
certbot                           internetarchive                   qpid-proton
chakra                            ipython                           qscintilla2
chapel                            ipython@5                         qtfaststart
checkstyle                        ircd-hybrid                       rancher-cli
chronograf                        jansson                           raylib
cimg                              jena                              re2
clamav                            jenkins                           recoverjpeg
cliclick                          jenkins-job-builder               remctl
clinfo                            jenkins-lts                       robot-framework
clojure                           jhipster                          rocksdb
closure-compiler                  json-glib                         saltstack
cockatrice                        keychain                          samtools
cockroach                         knot                              sbt
cocoapods                         kops                              scm-manager
collectd                          kubectx                           sdb
composer                          kubeless                          sfk
conan                             kubernetes-cli                    silk
conjure-up                        launch                            singular
consul                            lbdb                              skaffold
container-diff                    lcdf-typetools                    skafos
convox                            libcouchbase                      softhsm
coreos-ct                         libdill                           solr
couchdb                           libgit2                           sops
cppcheck                          libgit2-glib                      sourcekitten
cryptopp                          libgpg-error                      sourcery
cython                            libgweather                       sox
darcs                             libhttpseverywhere                sparse
dartsim                           liblwgeom                         spigot
davmail                           libmagic                          sqldiff
dbhash                            libphonenumber                    sqlite-analyzer
dcos-cli                          libqalculate                      sqliteodbc
ddgr                              librealsense                      sqlmap
dependency-check                  libressl                          src
di                                librsvg                           srt
discount                          libsoup                           ssh-copy-id
django-completion                 libsoxr                           sshuttle
dmd                               libspectre                        subversion
dnscrypt-proxy                    libuv                             svgcleaner
dnsdist                           libvirt                           swift
docfx                             libzip                            swiftlint
docker                            linkerd                           syncthing
docker-completion                 links                             sysbench
docker-compose                    lldpd                             talloc
docker-compose-completion         lmod                              tbb
docker2aci                        log4cplus                         teleport
doctl                             lolcat                            terraform
dscanner                          lxc                               terragrunt
dub                               mapnik                            testssl
duck                              maxwell                           timelimit
duti                              mediaconch                        tinyxml2
embulk                            mednafen                          tippecanoe
emscripten                        mercurial                         tmux
erlang@19                         metabase                          todo-txt
evince                            mill                              tup
exomizer                          miniupnpc                         txr
exploitdb                         mint                              uhd
eye-d3                            mitmproxy                         unbound
faas-cli                          mkvtoolnix                        vala
fail2ban                          mm-common                         vault
ffmbc                             modd                              vte3
fibjs                             monero                            watch
fig2dev                           mongo-c-driver                    webpack
file-formula                      mutt                              wildfly-as
firebase-cli                      mypy                              wine
fits                              nanopb-generator                  wireguard-tools
flatbuffers                       nats-streaming-server             wireshark
flawfinder                        ncmpc                             xonsh
flow                              ncmpcpp                           xrootd
fluent-bit                        nco                               xtensor
fn                                neofetch                          yarn
fobis                             nghttp2                           yash
folly                             nginx                             yaws
fonttools                         nifi                              yle-dl
fq                                node                              you-get
freetds                           nomad                             youtube-dl
frege                             notmuch                           zabbix
frugal                            nss                               zenity
futhark                           ntl                               znapzend
gcab                              nuget                             zsh
gdcm                              nvm
==> Renamed Formulae
php70 -> php@7.0
==> Deleted Formulae
arm

==> Downloading http://mirrors.jenkins.io/war/2.117/jenkins.war
==> Downloading from http://mirrors.tuna.tsinghua.edu.cn/jenkins/war/2.117/jenkins.war
######################################################################## 100.0%
==> jar xvf jenkins.war
==> Caveats
Note: When using launchctl the port will be 8080.

To have launchd start jenkins now and restart at login:
  brew services start jenkins
Or, if you don't want/need a background service you can just run:
  jenkins
==> Summary