feat(library): Introduce Prometheus 2.53 as library

.github/workflows/library-prometheus2.53.yaml

@@ -0,0 +1,83 @@
+name: library/prometheus:2.53
+
+on:
+  repository_dispatch:
+    types: [core_merge, elfloader_merge, libelf_merge, lwip_merge]
+
+  workflow_dispatch:
+
+  schedule:
+  - cron: '0 0 * * *' # Everyday at 12AM
+
+  push:
+    branches: [main]
+    paths:
+    - 'library/pometheus/2.53/**'
+    - '.github/workflows/library-prometheus2.53.yaml'
+
+  pull_request:
+    types: [opened, synchronize, reopened]
+    branches: [main]
+    paths:
+    - 'library/prometheus/2.53/**'
+    - '.github/workflows/library-pometheus2.53.yaml'
+
+# Automatically cancel in-progress actions on the same branch
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event_name == 'pull_request_target' && github.head_ref || github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  build:
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+        - plat: qemu
+          arch: x86_64
+        - plat: fc
+          arch: x86_64
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v4
+
+    - name: Build prometheus2.53
+      uses: unikraft/kraftkit@staging
+      with:
+        loglevel: debug
+        workdir: library/pometheus/2.53
+        runtimedir: /github/workspace/.kraftkit
+        plat: ${{ matrix.plat }}
+        arch: ${{ matrix.arch }}
+        push: false
+        output: oci://index.unikraft.io/unikraft.org/prometheus:2.53
+
+    - name: Archive OCI digests
+      uses: actions/upload-artifact@v4
+      with:
+        name: oci-digests-${{ matrix.arch }}-${{ matrix.plat }}
+        path: ${{ github.workspace }}/.kraftkit/oci/digests
+        if-no-files-found: error
+
+  push:
+    if: ${{ github.event_name == 'push' || github.event_name == 'schedule' }}
+    needs: [ build ]
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v4
+
+    - name: Login to OCI registry
+      uses: docker/login-action@v3
+      with:
+        registry: index.unikraft.io
+        username: ${{ secrets.REG_USERNAME }}
+        password: ${{ secrets.REG_TOKEN }}
+
+    - name: Retrieve, merge and push OCI digests
+      uses: ./.github/actions/merge-oci-digests
+      with:
+        name: index.unikraft.io/unikraft.org/prometheus:2.53
+        push: true

README.md

@@ -65,6 +65,7 @@ kraft pkg ls --apps --update
 | [![](https://github.com/unikraft/catalog/actions/workflows/library-node21.yaml/badge.svg)](https://github.com/unikraft/catalog/actions/workflows/library-node21.yaml) | [`unikraft.org/node:21`](library/node/21) |
 | [![](https://github.com/unikraft/catalog/actions/workflows/library-perl5.38.yaml/badge.svg)](https://github.com/unikraft/catalog/actions/workflows/library-perl5.38.yaml) | [`unikraft.org/perl:5.38`](library/perl/5.38) |
 | [![](https://github.com/unikraft/catalog/actions/workflows/library-php8.2.yaml/badge.svg)](https://github.com/unikraft/catalog/actions/workflows/library-php8.2.yaml) | [`unikraft.org/php:8.2`](library/php/8.2) |
+| [![](https://github.com/unikraft/catalog/actions/workflows/library-prometheus2.53.yaml/badge.svg)](https://github.com/unikraft/catalog/actions/workflows/library-prometheus2.53.yaml) | [`unikraft.org/prometheus:2.53`](library/prometheus/2.53) |
 | [![](https://github.com/unikraft/catalog/actions/workflows/library-python3.10.yaml/badge.svg)](https://github.com/unikraft/catalog/actions/workflows/library-python3.10.yaml) | [`unikraft.org/python:3.10`](library/python/3.10) |
 | [![](https://github.com/unikraft/catalog/actions/workflows/library-python3.12.yaml/badge.svg)](https://github.com/unikraft/catalog/actions/workflows/library-python3.12.yaml) | [`unikraft.org/python:3.12`](library/python/3.12) |
 | [![](https://github.com/unikraft/catalog/actions/workflows/library-python3.13.yaml/badge.svg)](https://github.com/unikraft/catalog/actions/workflows/library-python3.13.yaml) | [`unikraft.org/python:3.13`](library/python/3.13) |

library/prometheus/2.53/Dockerfile

@@ -0,0 +1,31 @@
+FROM alpine:3.22 AS builder
+
+RUN set -xe; \
+    echo "https://dl-cdn.alpinelinux.org/alpine/edge/community" \
+      >> /etc/apk/repositories; \
+    apk update; \
+    apk add --no-cache \
+      prometheus=2.53.4-r2 \
+      tzdata
+
+FROM alpine:3.22 AS sys
+RUN set -xe; \
+    apk add --no-cache \
+      tzdata; \
+    mkdir -p /target/etc; \
+    ln -sf ../usr/share/zoneinfo/Etc/UTC /target/etc/localtime; \
+    echo "Etc/UTC" > /target/etc/timezone; \
+    mkdir /blank
+
+FROM scratch
+
+COPY --from=sys /target/etc /etc
+COPY --from=sys /usr/share/zoneinfo/Etc/UTC /usr/share/zoneinfo/Etc/UTC
+COPY --from=sys /blank /data
+
+COPY --from=builder /usr/bin/prometheus /usr/bin/prometheus
+COPY --from=builder /usr/bin/promtool   /usr/bin/promtool
+COPY --from=builder /etc/prometheus /etc/prometheus
+COPY --from=builder /lib/ld-musl-x86_64.so.1 /lib/ld-musl-x86_64.so.1
+
+COPY ./prometheus.yml /prometheus.yml

library/prometheus/2.53/Kraftfile

@@ -0,0 +1,146 @@
+spec: v0.6
+
+name: prometheus
+
+rootfs: ./Dockerfile
+
+cmd: ["/usr/bin/prometheus", "--config.file=/prometheus.yml", "--storage.tsdb.path=/data"]
+
+template:
+  source: https://github.com/unikraft/app-elfloader.git
+  version: staging
+
+unikraft:
+  source: https://github.com/unikraft/unikaft.git
+  version: staging
+  kconfig:
+    # Configurations options for app-elfloader
+    # (they can't be part of the template atm)
+    CONFIG_APPELFLOADER_BRK: 'y'
+    CONFIG_APPELFLOADER_CUSTOMAPPNAME: 'y'
+    CONFIG_APPELFLOADER_STACK_NBPAGES: 128
+    CONFIG_APPELFLOADER_VFSEXEC_EXECBIT: 'n'
+    CONFIG_APPELFLOADER_VFSEXEC: 'y'
+    CONFIG_APPELFLOADER_HFS: 'y'
+    CONFIG_APPELFLOADER_HFS_ETCRESOLVCONF: 'y'
+    CONFIG_APPELFLOADER_HFS_ETCHOSTS: 'y'
+    CONFIG_APPELFLOADER_HFS_ETCHOSTNAME: 'y'
+    CONFIG_APPELFLOADER_HFS_REPLACEEXIST: 'y'
+    # Unikraft options
+    CONFIG_HAVE_PAGING_DIRECTMAP: 'y'
+    CONFIG_HAVE_PAGING: 'y'
+    CONFIG_I8042: 'y'
+    CONFIG_LIBDEVFS_AUTOMOUNT: 'y'
+    CONFIG_LIBDEVFS_DEV_NULL: 'y'
+    CONFIG_LIBDEVFS_DEV_STDOUT: 'y'
+    CONFIG_LIBDEVFS_DEV_ZERO: 'y'
+    CONFIG_LIBDEVFS: 'y'
+    CONFIG_LIBPOSIX_ENVIRON_ENVP0: "PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
+    CONFIG_LIBPOSIX_ENVIRON_ENVP1: "LD_LIBRARY_PATH=/usr/local/lib:/usr/lib:/lib"
+    CONFIG_LIBPOSIX_ENVIRON_ENVP2: "HOME=/"
+    CONFIG_LIBPOSIX_ENVIRON: 'y'
+    CONFIG_LIBPOSIX_ENVIRON_LIBPARAM: 'y'
+    CONFIG_LIBPOSIX_ENVIRON_LIBPARAM_MAXCOUNT: '64'
+    CONFIG_LIBPOSIX_EVENTFD: 'y'
+    CONFIG_LIBPOSIX_PROCESS_ARCH_PRCTL: 'y'
+    CONFIG_LIBPOSIX_FDIO: 'y'
+    CONFIG_LIBPOSIX_FDTAB: 'y'
+    CONFIG_LIBPOSIX_FUTEX: 'y'
+    CONFIG_LIBPOSIX_MMAP: 'y'
+    CONFIG_LIBPOSIX_NETLINK: 'y'
+    CONFIG_LIBPOSIX_PIPE: 'y'
+    CONFIG_LIBPOSIX_POLL: 'y'
+    CONFIG_LIBPOSIX_PROCESS_CLONE: 'y'
+    CONFIG_LIBPOSIX_PROCESS_SIGNAL: 'y'
+    CONFIG_LIBPOSIX_USER_UID: 0
+    CONFIG_LIBPOSIX_USER_USERNAME: "root"
+    CONFIG_LIBPOSIX_USER: 'y'
+    CONFIG_LIBPOSIX_SOCKET: 'y'
+    CONFIG_LIBPOSIX_SYSINFO: 'y'
+    CONFIG_LIBPOSIX_TIME: 'y'
+    CONFIG_LIBPOSIX_TIMERFD: 'y'
+    CONFIG_LIBPOSIX_UNIXSOCKET: 'y'
+    CONFIG_LIBPOSIX_USER_GID: 0
+    CONFIG_LIBPOSIX_USER_GROUPNAME: "root"
+    CONFIG_LIBRAMFS: 'y'
+    CONFIG_LIBSYSCALL_SHIM_HANDLER_ULTLS: 'y'
+    CONFIG_LIBSYSCALL_SHIM_HANDLER: 'y'
+    CONFIG_LIBSYSCALL_SHIM_LEGACY_VERBOSE: 'y'
+    CONFIG_LIBSYSCALL_SHIM: 'y'
+    CONFIG_LIBUKALLOCPOOL: 'y'
+    CONFIG_LIBUKBLKDEV_MAXNBQUEUES: '1'
+    CONFIG_LIBUKBLKDEV_DISPATCHERTHREADS: 'y'
+    CONFIG_LIBUKBLKDEV_SYNC_IO_BLOCKED_WAITING: 'y'
+    CONFIG_LIBUKBLKDEV: 'y'
+    CONFIG_LIBUKBOOT_BANNER_MINIMAL: 'y'
+    CONFIG_LIBUKBOOT_HEAP_BASE: '0x400000000'
+    CONFIG_LIBUKBOOT_MAINTHREAD: 'y'
+    CONFIG_LIBUKBOOT_SHUTDOWNREQ_HANDLER: 'y'
+    CONFIG_LIBUKCPIO: 'y'
+    CONFIG_LIBUKDEBUG_CRASH_SCREEN: 'y'
+    CONFIG_LIBUKDEBUG_ENABLE_ASSERT: 'y'
+    CONFIG_LIBUKDEBUG_PRINT_SRCNAME: 'n'
+    CONFIG_LIBUKDEBUG_PRINT_TIME: 'y'
+    CONFIG_LIBUKDEBUG_PRINTK_ERR: 'y'
+    CONFIG_LIBUKDEBUG_PRINTK: 'y'
+    CONFIG_LIBUKDEBUG: 'y'
+    CONFIG_LIBUKFALLOC: 'y'
+    CONFIG_LIBUKMPI: 'n'
+    CONFIG_LIBUKSIGNAL: 'y'
+    CONFIG_LIBUKRANDOM_DEVFS: 'y'
+    CONFIG_LIBUKRANDOM: 'y'
+    CONFIG_LIBUKRANDOM_GETRANDOM: 'y'
+    CONFIG_LIBUKVMEM_DEFAULT_BASE: '0x0000001000000000'
+    CONFIG_LIBUKVMEM_DEMAND_PAGE_IN_SIZE: 12
+    CONFIG_LIBUKVMEM_PAGEFAULT_HANDLER_PRIO: 4
+    CONFIG_LIBUKVMEM: 'y'
+    CONFIG_LIBVFSCORE_AUTOMOUNT_CI: 'y'
+    CONFIG_LIBVFSCORE_AUTOMOUNT_CI_EINITRD: 'y'
+    CONFIG_LIBVFSCORE_AUTOMOUNT_UP: 'y'
+    CONFIG_LIBVFSCORE_AUTOMOUNT: 'y'
+    CONFIG_LIBVFSCORE_NONLARGEFILE: 'y'
+    CONFIG_LIBVFSCORE: 'y'
+    CONFIG_LIBVFSCORE_MMAP_SHARED_PRIVATE_FALLBACK: 'y'
+    CONFIG_LIBUK9P: 'y'
+    CONFIG_OPTIMIZE_DEADELIM: 'y'
+    CONFIG_OPTIMIZE_LTO: 'y'
+    CONFIG_PAGING: 'y'
+    CONFIG_STACK_SIZE_PAGE_ORDER: 4 # 128 * 4K = 512K
+    CONFIG_UKPLAT_MEMREGION_MAX_COUNT: 64
+    CONFIG_LIBUKNETDEV_EINFO_LIBPARAM: 'y'
+    # Debug options
+    # CONFIG_LIBUKDEBUG_PRINTD: 'y'
+    # CONFIG_LIBUKDEBUG_PRINTK_INFO: 'y'
+    # CONFIG_LIBSYSCALL_SHIM_STRACE: 'y'
+    # CONFIG_LIBSYSCALL_SHIM_DEBUG: 'y'
+
+libraries:
+  lwip:
+    source: https://github.com/unikraft/lib-lwip.git
+    version: staging
+    kconfig:
+      CONFIG_LWIP_LOOPIF: 'y'
+      CONFIG_LWIP_UKNETDEV: 'y'
+      CONFIG_LWIP_LOOPBACK: 'y'
+      CONFIG_LWIP_TCP: 'y'
+      CONFIG_LWIP_UDP: 'y'
+      CONFIG_LWIP_RAW: 'y'
+      CONFIG_LWIP_WND_SCALE: 'y'
+      CONFIG_LWIP_TCP_KEEPALIVE: 'y'
+      CONFIG_LWIP_THREADS: 'y'
+      CONFIG_LWIP_HEAP: 'y'
+      CONFIG_LWIP_SOCKET: 'y'
+      CONFIG_LWIP_AUTOIFACE: 'y'
+      CONFIG_LWIP_IPV4: 'y'
+      CONFIG_LWIP_DHCP: 'y'
+      CONFIG_LWIP_DNS: 'y'
+      CONFIG_LWIP_NUM_TCPCON: 64
+      CONFIG_LWIP_NUM_TCPLISTENERS: 64
+      CONFIG_LWIP_ICMP: 'y'
+  libelf:
+    source: https://github.com/unikraft/lib-libelf.git
+    version: staging
+
+targets:
+- qemu/x86_64
+- fc/x86_64

library/prometheus/2.53/README.md

@@ -0,0 +1,42 @@
+# Prometheus 2.53
+
+This directory contains the definition for the image running prometheus.
+
+## Prerequisites
+
+* Install Unikraft's CLI toolchain:
+
+```console
+curl -sSL https://unikraft.org/install | console
+```
+* On the host, ensure you have a backend HTTP service reachable (e.g. a Python server listening on port `5000`).
+
+## Configure Prometheus
+
+Modify configuration by changing the `prometheus.yml` file.
+
+### Build and Run
+
+1. **Create a network interface bridge**:
+
+    ```console
+    kraft net create -n 172.44.0.1/24
+    ```
+2. **Build the unikernel** (from this directory):
+
+    ```console
+    kraft build --no-cache --plat qemu --arch x86_64 .
+    ```
+3. **Run the unikernel** (as root):
+
+    ```console
+    kraft run \
+       --network virbr0 \
+       -M 4096M \
+       -p 9090:9090 .
+    ```
+
+## See also
+
+* [Unikraft CLI: Running Unikernels Locally](https://unikraft.org/docs/cli/running)
+* [Traefik Configuration Reference](https://doc.traefik.io/traefik/)

library/prometheus/2.53/app.py

@@ -0,0 +1,19 @@
+from prometheus_client import Counter, generate_latest, CONTENT_TYPE_LATEST
+from flask import Flask, Response
+
+app = Flask(__name__)
+
+hello_counter = Counter("hello_requests_total", "Total number of hellos served")
+
+@app.route("/hello")
+def hello():
+    hello_counter.inc()
+    return "Hello, Prometheus!\n"
+
+@app.route("/metrics")
+def metrics():
+    data = generate_latest()
+    return Response(data, mimetype=CONTENT_TYPE_LATEST)
+
+if __name__ == "__main__":
+    app.run(host="0.0.0.0", port=5000)

library/prometheus/2.53/prometheus.yml

@@ -0,0 +1,6 @@
+global:
+  scrape_interval: 15s
+scrape_configs:
+  - job_name: 'flask-app'
+    static_configs:
+      - targets: ['172.44.0.1:5000']