Appliscale · gomoripeti · Jun 9, 2026 · Jun 10, 2026
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
@@ -35,100 +35,32 @@ jobs:
         - otp_version: 25
 
         - otp_version: 24
-
-        - otp_version: 23
-
-        - otp_version: 22
-
-        - otp_version: 21
           send_coverage: true
-          run_dialyzer: true
 
     steps:
     - uses: actions/checkout@v3
 
-    - if: matrix.old_rebar
-      run: echo "REBAR3=./rebar3" >> $GITHUB_ENV
-
     - if: matrix.erl_hist
       run: echo "XPROF_ERL_HIST=true" >> $GITHUB_ENV
 
-    - if: matrix.old_cowboy
-      run: echo "COWBOY_VERSION=1.1.2" >> $GITHUB_ENV
-
     - name: Cache hex packages
       uses: actions/cache@v3
       with:
         path: $HOME/.cache/rebar3
         key: ${{ matrix.otp_version }}-rebar3-cache
 
-    # cowboy 2.7+ require OTP 20 and 2.11+ require OTP 24+. On OTP 19-23 pin to
-    # cowboy 2.6.3, last version that compiles fine on these old OTP versions.
-    - if: ${{ matrix.otp_version <= 23 && !matrix.old_cowboy }}
-      run: echo "COWBOY_VERSION=2.6.3" >> $GITHUB_ENV
-
     - run: make test
 
     - if: matrix.run_dialyzer
       run: make dialyzer
       timeout-minutes: 8
 
     - if: matrix.send_coverage && success()
-      run: ./rebar3 as test coveralls send
+      run: make send_coveralls
       env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
       continue-on-error: true
 
-  # Same as the "test" job but for OTP 18-20, whose containers ship a glibc
-  # too old for the node20 runtime that actions/checkout and actions/cache
-  # now require. This job checks out with plain git and skips the cache.
-  test_legacy:
-    name: OTP ${{ matrix.otp_version }} (legacy)
-    runs-on: ubuntu-latest
-    container: erlang:${{ matrix.otp_version }}
-
-    strategy:
-      fail-fast: false
-      matrix:
-        include:
-        - otp_version: 20
-
-        - otp_version: 19
-
-        - otp_version: 19
-          erl_hist: true
-
-        - otp_version: 18
-          # old_rebar fails with "Package not found in registry: {<<"hdr_histogram">>,<<"0.5.0">>}."
-          # with hdr_histogram NIF: xprof_core_hist_SUITE: Segmentation fault (core dumped)
-          erl_hist: true
-          old_cowboy: true
-
-    steps:
-    - name: Checkout with git (avoids node-based actions on old glibc)
-      run: |
-        git config --global --add safe.directory $GITHUB_WORKSPACE
-        git init -q
-        git remote add origin "https://github.com/${{ github.repository }}"
-        git fetch -q --depth 1 origin "${{ github.ref }}"
-        git checkout -q FETCH_HEAD
-
-    - if: matrix.old_rebar
-      run: echo "REBAR3=./rebar3" >> $GITHUB_ENV
-
-    - if: matrix.erl_hist
-      run: echo "XPROF_ERL_HIST=true" >> $GITHUB_ENV
-
-    - if: matrix.old_cowboy
-      run: echo "COWBOY_VERSION=1.1.2" >> $GITHUB_ENV
-
-    # cowboy 2.7+ require OTP 20 and 2.11+ require OTP 24+. On OTP 19-23 pin to
-    # cowboy 2.6.3, last version that compiles fine on these old OTP versions.
-    - if: ${{ matrix.otp_version <= 23 && !matrix.old_cowboy }}
-      run: echo "COWBOY_VERSION=2.6.3" >> $GITHUB_ENV
-
-    - run: make test
-
   test_json_lib:
     name: Test different json lib (${{ matrix.json_lib }} | OTP ${{ matrix.otp_version }})
     runs-on: ubuntu-latest
@@ -138,7 +70,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        otp_version: [21]
+        otp_version: [24]
         json_lib: [jiffy, jsx, thoas]
 
     steps:
@@ -150,11 +82,6 @@ jobs:
         path: $HOME/.cache/rebar3
         key: ${{ matrix.otp_version }}-rebar3-cache-json-lib
 
-    # cowboy 2.7+ require OTP 20 and 2.11+ require OTP 24+. On OTP 19-23 pin to
-    # cowboy 2.6.3, last version that compiles fine on these old OTP versions.
-    - if: ${{ matrix.otp_version <= 23 && !matrix.old_cowboy }}
-      run: echo "COWBOY_VERSION=2.6.3" >> $GITHUB_ENV
-
     - run: make test_${{ matrix.json_lib }}
 
   test_docs:
@@ -263,26 +190,15 @@ jobs:
         elixir-version: ${{matrix.elixir}}
         rebar3-version: ${{matrix.rebar3}}
 
-    - if: matrix.old_rebar
-      run: echo "REBAR3=./rebar3" >> $GITHUB_ENV
-
     - if: matrix.erl_hist
       run: echo "XPROF_ERL_HIST=true" >> $GITHUB_ENV
 
-    - if: matrix.old_cowboy
-      run: echo "COWBOY_VERSION=1.1.2" >> $GITHUB_ENV
-
     - name: Cache hex packages
       uses: actions/cache@v3
       with:
         path: $HOME/.cache/rebar3
         key: ${{ matrix.otp_version }}-rebar3-cache
 
-    # cowboy 2.7+ require OTP 20 and 2.11+ require OTP 24+. On OTP 19-23 pin to
-    # cowboy 2.6.3, last version that compiles fine on these old OTP versions.
-    - if: ${{ matrix.otp_version <= 23 && !matrix.old_cowboy }}
-      run: echo "COWBOY_VERSION=2.6.3" >> $GITHUB_ENV
-
     - run: make test
 
   test_front_end:

diff --git a/.travis.yml b/.travis.yml
diff --git a/Makefile b/Makefile
@@ -2,23 +2,17 @@ JS_PRIV=apps/xprof_gui/priv
 BIN_DIR:=node_modules/.bin
 REBAR3?=$(shell which rebar3 || echo ./rebar3)
 
-# this will update cowboy version based on rebar.config overwriting the lock file
-ifdef COWBOY_VERSION
-	MAYBE_UPDATE_COWBOY = $(REBAR3) upgrade cowboy
-endif
 ifdef XPROF_ERL_HIST
 	MAYBE_UNLOCK_HIST = $(REBAR3) unlock hdr_histogram
 endif
 
 compile:
-	$(MAYBE_UPDATE_COWBOY)
 	$(MAYBE_UNLOCK_HIST)
 	$(REBAR3) compile
 
 dev: dev_front_end dev_back_end
 
 dev_back_end:
-	$(MAYBE_UPDATE_COWBOY)
 	$(MAYBE_UNLOCK_HIST)
 	$(REBAR3) as dev compile, shell
 
@@ -37,28 +31,27 @@ build_prod_front_end:
 	cd $(JS_PRIV); npm run build
 
 test: compile
-	$(MAYBE_UPDATE_COWBOY)
 	$(MAYBE_UNLOCK_HIST)
 	$(REBAR3) as test do cover --reset, eunit -c, ct -c, cover --verbose
 
 test_jiffy:
-	$(MAYBE_UPDATE_COWBOY)
 	$(MAYBE_UNLOCK_HIST)
 	export XPROF_JSON_LIB=jiffy; \
 	$(REBAR3) as test_jiffy do compile, dialyzer, cover --reset, ct -c, cover --verbose
 
 test_jsx:
-	$(MAYBE_UPDATE_COWBOY)
 	$(MAYBE_UNLOCK_HIST)
 	export XPROF_JSON_LIB=jsx; \
 	$(REBAR3) as test_jsx do compile, dialyzer, cover --reset, ct -c, cover --verbose
 
 test_thoas:
-	$(MAYBE_UPDATE_COWBOY)
 	$(MAYBE_UNLOCK_HIST)
 	export XPROF_JSON_LIB=thoas; \
 	$(REBAR3) as test_thoas do compile, dialyzer, cover --reset, ct -c, cover --verbose
 
+send_coveralls:
+	$(REBAR3) as test coveralls send
+
 doc:
 	$(REBAR3) edoc
 
@@ -68,7 +61,6 @@ doc:
 	    -e '1 s|\[!\[.*||' README.md > ./doc/src/readme.md
 
 gen_ex_doc: ./doc/src/readme.md
-	$(MAYBE_UPDATE_COWBOY)
 	$(MAYBE_UNLOCK_HIST)
 	$(REBAR3) as docs ex_doc --app xprof_core
 	$(REBAR3) as docs ex_doc --app xprof_gui
@@ -77,7 +69,6 @@ gen_ex_doc: ./doc/src/readme.md
 	$(REBAR3) as docs ex_doc --app xprof
 
 dialyzer:
-	$(MAYBE_UPDATE_COWBOY)
 	$(MAYBE_UNLOCK_HIST)
 	$(REBAR3) dialyzer
 
@@ -87,4 +78,4 @@ publish:
 publish_docs: gen_ex_doc
 	$(REBAR3) as publish hex docs
 
-.PHONY: compile dev dev_back_end dev_front_end npm bootstrap_front_end test_front_end build_prod_front_end test doc gen_ex_doc dialyzer publish publish_docs
+.PHONY: compile dev dev_back_end dev_front_end npm bootstrap_front_end test_front_end build_prod_front_end test send_coveralls doc gen_ex_doc dialyzer publish publish_docs
diff --git a/README.md b/README.md
@@ -1,4 +1,4 @@
-XProf [![Build Status](https://travis-ci.org/Appliscale/xprof.svg?branch=master)](https://travis-ci.org/Appliscale/xprof) [![Coverage Status](https://coveralls.io/repos/github/Appliscale/xprof/badge.svg?branch=master)](https://coveralls.io/github/Appliscale/xprof?branch=master) [![Hex.pm](https://img.shields.io/hexpm/v/xprof.svg?style=flat-square)](https://hex.pm/packages/xprof) [![Hex.pm](https://img.shields.io/hexpm/dt/xprof.svg?style=flat-square)](https://hex.pm/packages/xprof) [![Gitter](https://badges.gitter.im/Appliscale/xprof.svg)](https://gitter.im/Appliscale/xprof?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge)
+XProf [![Coverage Status](https://coveralls.io/repos/github/Appliscale/xprof/badge.svg?branch=master)](https://coveralls.io/github/Appliscale/xprof?branch=master) [![Hex.pm](https://img.shields.io/hexpm/v/xprof.svg?style=flat-square)](https://hex.pm/packages/xprof) [![Hex.pm](https://img.shields.io/hexpm/dt/xprof.svg?style=flat-square)](https://hex.pm/packages/xprof) [![Gitter](https://badges.gitter.im/Appliscale/xprof.svg)](https://gitter.im/Appliscale/xprof?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge)
 =====
 
 *XProf* is a visual tracer and profiler that allows you to track execution of Elixir / Erlang
@@ -50,7 +50,7 @@ The preferred way is to add the `xprof` *Hex* package as a dependency to your re
 
 {deps, [
        ...
-       {xprof, "2.0.0-rc.5"}
+       {xprof, "2.0.0"}
 ]}.
 ```
 
@@ -60,7 +60,7 @@ The preferred way is to add the `xprof` *Hex* package as a dependency to your re
 defp deps do
     [
       ...
-      {:xprof, "~> 2.0.0-rc.5"}
+      {:xprof, "~> 2.0.0"}
     ]
   end
 ```
@@ -70,15 +70,15 @@ You can also fetch from the github repository (not recommended, only for develop
 ```erlang
 {deps, [
         ...
-        {xprof_core, {git_subdir, "https://github.com/Appliscale/xprof.git", {tag, "2.0.0-rc.5"}, "apps/xprof_core"}},
-        {xprof_gui, {git_subdir, "https://github.com/Appliscale/xprof.git", {tag, "2.0.0-rc.5"}, "apps/xprof_gui"}},
-        {xprof, {git_subdir, "https://github.com/Appliscale/xprof.git", {tag, "2.0.0-rc.5"}, "apps/xprof"}}
+        {xprof_core, {git_subdir, "https://github.com/Appliscale/xprof.git", {tag, "2.0.0"}, "apps/xprof_core"}},
+        {xprof_gui, {git_subdir, "https://github.com/Appliscale/xprof.git", {tag, "2.0.0"}, "apps/xprof_gui"}},
+        {xprof, {git_subdir, "https://github.com/Appliscale/xprof.git", {tag, "2.0.0"}, "apps/xprof"}}
 ]}.
 ```
 
 ## Supported Versions
 
-XProf currently supports Erlang/OTP 18 - 29 and Elixir 1.11-1.20.
+XProf currently supports Erlang/OTP 24 - 29 and Elixir 1.11-1.20.
 Newer OTP versions (if any) might work but are not tested.
 
 ## Syntax mode
@@ -138,12 +138,6 @@ library. If you have compilation problems you can choose to use a
 native Erlang histogram implementation by defining the OS env var
 `XPROF_ERL_HIST` when compiling `xprof_core`.
 
-`COWBOY_VERSION` - By default XProf uses Cowboy version 2.x. This
-version is only supported from Erlang/OTP 19 and is not backwards
-compatible with older Cowboy versions. If for some reason you would
-like to use Cowboy version 1.x you can define the OS env var
-`COWBOY_VERSION=1` when compiling `xprof_gui`.
-
 `XPROF_JSON_LIB` - By default XProf uses the `jsone` library. If you
 would like to use a different json library you can define the OS env
 var `XPROF_JSON_LIB` when compiling `xprof_gui`. It is assumed that
@@ -155,7 +149,6 @@ Examples
 
 ```
 export XPROF_ERL_HIST=true
-export COWBOY_VERSION=1
 export XPROF_JSON_LIB='Elixir.Jason'
 export XPROF_JSON_ENC_FUN='encode!'
 ```

diff --git a/apps/xprof/src/xprof.app.src b/apps/xprof/src/xprof.app.src
@@ -1,6 +1,6 @@
 {application, xprof,
  [{description, "Visual tracer and profiler for BEAM languages"}
- ,{vsn, "2.0.0-rc.5"}
+ ,{vsn, "2.0.0"}
  ,{registered, []}
  ,{applications,
    [kernel,

diff --git a/apps/xprof_core/rebar.config b/apps/xprof_core/rebar.config
@@ -2,6 +2,4 @@
  [{hdr_histogram, "~> 0.5"}
  ]}.
 
-{erl_opts, [debug_info,
-            {platform_define, "^[^R1]", ceil_floor} %% from OTP 20
-           ]}.
+{erl_opts, [debug_info]}.
diff --git a/apps/xprof_core/rebar.config.script b/apps/xprof_core/rebar.config.script
@@ -30,18 +30,4 @@ ErlHist =
           end
   end.
 
-Rebar2 =
-  fun(Config0) ->
-          case erlang:function_exported(rebar3, main, 1) of
-              true -> % rebar3
-                  Config0;
-              false -> % rebar 2.x or older
-                  %% Only include app names for deps.
-                  %% Top level app should declare source and version.
-                  Deps = proplists:get_value(deps, Config0, []),
-                  NewDeps = [element(1, Dep)||Dep <- Deps],
-                  lists:keystore(deps, 1, Config0, {deps, NewDeps})
-          end
-  end.
-
-Rebar2(ErlHist(CONFIG)).
+ErlHist(CONFIG).
diff --git a/apps/xprof_core/src/xprof_core.app.src b/apps/xprof_core/src/xprof_core.app.src
@@ -1,6 +1,6 @@
 {application, xprof_core,
  [{description, "Visual BEAM tracer/profiler tracer core"}
- ,{vsn, "2.0.0-rc.5"}
+ ,{vsn, "2.0.0"}
  ,{registered, []}
  ,{mod, {'xprof_core_app', []}}
  ,{applications,