async version bump

Added changelog.
Added info about Docker Hub pull limit.

README.md

@@ -10,24 +10,22 @@
   <a href="https://github.com/sponsors/mag37"><img src="https://img.shields.io/badge/-Sponsor-grey?style=flat-square&logo=github" alt="Github Sponsor"></a>
 </p>
 
-<h3 align="center">CLI tool to automate docker image updates. <br>No <b>pre-pull</b>, selective, optional notifications and prune when done.</h3>
-<h2 align="center">Now with simple notification integrations!</h2>
-<h4 align="center">With features like excluding specific containers, custom container labels, auto-prune when done and more.</h4>
-<h4 align="center">Also see the fresh Podman fork <a href="https://github.com/sudo-kraken/podcheck">sudo-kraken/podcheck</a>!</h4>
+<h2 align="center">CLI tool to automate docker image updates or notifying when updates are available.</h2>
+<h3 align="center">Features:</h3>
+<h3 align="center">selective updates, exclude containers, custom labels, notification plugins, prune when done and more.</h3>
+
+<h4 align="center">For Podman - see the fork <a href="https://github.com/sudo-kraken/podcheck">sudo-kraken/podcheck</a>!</h4>
+
+<h4 align="center">:whale: Docker Hub pull limit :chart_with_downwards_trend: not an issue for checks but for actual pulls - <a href="#whale-docker-hub-pull-limit-chart_with_downwards_trend-not-an-issue-for-checks-but-for-actual-pulls">read more</a></h4>
 
 ___
 ## :bell: Changelog
 
-- **v0.5.3**: Local image check changed (use imageId instead of name) and Gotify-template fixed (whale icon removed).
+- **v0.5.6.0**: Heavily improved performance due to async checking for updates. 
+- **v0.5.5.0**: osx and bsd compatibility changes + rewrite of dependency installer
+- **v0.5.4.0**: Added support for a Prometheus+node_exporter metric collection through a file collector.
+- **v0.5.3.0**: Local image check changed (use imageId instead of name) and Gotify-template fixed (whale icon removed).
 - **v0.5.2.1**: Rewrite of dependency downloads, jq can be installed with package manager or static binary.
-- **v0.5.1**: DEPENDENCY WARNING: now requires **jq**. + Upstreaming changes from [sudo-kraken/podcheck](https://github.com/sudo-kraken/podcheck)
-- **v0.5.0**: Rewritten notify logic - all templates are adjusted and should be migrated!
-    - Copy the custom settings from your current template to the new version of the same template.
-    - Look into, copy and customize the `urls.list` file if that's of interest.
-    - Other changes: 
-        - Added Discord notify template.
-        - Verbosity changed of `regctl`.
-- **v0.4.9**: Added a function to enrich the notify-message with release note URLs. See [Release notes addon](https://github.com/mag37/dockcheck#date-release-notes-addon-to-notifications)
 ___
 
 
@@ -41,6 +39,7 @@ Example:    dockcheck.sh -y -d 10 -e nextcloud,heimdall
 
 Options:"
 -a|y   Automatic updates, without interaction.
+-c D   Exports metrics as prom file for the prometheus node_exporter. Provide the collector textfile directory.
 -d N   Only update to new images that are N+ days old. Lists too recent with +prefix and age. 2xSlower.
 -e X   Exclude containers, separated by comma.
 -f     Force stack restart after update. Caution: restarts once for every updated container within stack.
@@ -80,6 +79,7 @@ ___
 ## :nut_and_bolt: Dependencies
 - Running docker (duh) and compose, either standalone or plugin. (see [Podman fork](https://github.com/sudo-kraken/podcheck)  
 - Bash shell or compatible shell of at least v4.3
+  - POSIX `xargs`, usually default but can be installed with the `findutils` package - to enable async.
 - [jq](https://github.com/jqlang/jq)
   - User will be prompted to install with package manager or download static binary.
 - [regclient/regctl](https://github.com/regclient/regclient) (Licensed under [Apache-2.0 License](http://www.apache.org/licenses/LICENSE-2.0))  
@@ -88,6 +88,7 @@ ___
 
 ## :tent: Install Instructions
 Download the script to a directory in **PATH**, I'd suggest using `~/.local/bin` as that's usually in **PATH**.   
+For OSX/macOS preferably use `/usr/local/bin`.
 ```sh
 # basic example with curl:
 curl -L https://raw.githubusercontent.com/mag37/dockcheck/main/dockcheck.sh -o ~/.local/bin/dockcheck.sh
@@ -95,6 +96,9 @@ chmod +x ~/.local/bin/dockcheck.sh
 
 # or oneliner with wget:
 wget -O ~/.local/bin/dockcheck.sh "https://raw.githubusercontent.com/mag37/dockcheck/main/dockcheck.sh" && chmod +x ~/.local/bin/dockcheck.sh
+
+# OSX or macOS version with curl:
+ curl -L https://raw.githubusercontent.com/mag37/dockcheck/main/dockcheck.sh -o /usr/local/bin/dockcheck.sh && chmod +x /usr/local/bin/dockcheck.sh
 ```
 Then call the script anywhere with just `dockcheck.sh`.
 Add preferred `notify.sh`-template to the same directory - this will not be touched by the scripts self-update function.
@@ -135,6 +139,17 @@ nginx  ->  https://github.com/docker-library/official-images/blob/master/library
 ```
 The `urls.list` file is just an example and I'd gladly see that people contribute back when they add their preferred URLs to their lists.
 
+## :chart_with_upwards_trend: Prometheus and node_exporter
+Dockcheck can be used together with [Prometheus](https://github.com/prometheus/prometheus) and [node_exporter](https://github.com/prometheus/node_exporter) to export metrics via the file collector, scheduled with cron or likely.
+This is done with the `-c` option, like this:
+```
+dockcheck.sh -c /path/to/exporter/directory
+```
+
+See the [README.md](./addons/prometheus/README.md) for more detailed information on how to set it up!
+
+<sub><sup>Contributed by [tdralle](https://github.com/tdralle).</sup></sub>  
+
 ## :bookmark: Labels
 Optionally add labels to compose-files. Currently these are the usable labels:
 ```
@@ -165,7 +180,15 @@ chmod 755 regctl
 ```
 Test it with `./regctl --help` and then either add the file to the same path as *dockcheck.sh* or in your path (eg. `~/.local/bin/regctl`).
 
-## :guardsman: Function to auth with docker hub before running
+## :whale: Docker Hub pull limit :chart_with_downwards_trend: not an issue for checks but for actual pulls
+Due to recent changes in [Docker Hub usage and limits](https://docs.docker.com/docker-hub/usage/)
+>Unauthenticated users: 10 pulls/hour   
+>Authenticated users with a free account: 100 pulls/hour
+
+This is not an issue for registry checks. But if you have a large stack and pull more than 10 updates at once consider updating more often or to create a free account.
+You could use/modify the login-wrapper function in the example below to automate the login prior to running `dockcheck.sh`.
+
+### :guardsman: Function to auth with docker hub before running
 **Example** - Change names, paths, and remove cat+password flag if you rather get prompted:
 ```sh
 function dchk {
@@ -199,4 +222,3 @@ dockcheck is created and released under the [GNU GPL v3.0](https://www.gnu.org/l
 ___
 
 ### :floppy_disk: The [story](https://mag37.org/posts/project_dockcheck/) behind it. 1 year in retrospect.
-

addons/prometheus/README.md

@@ -0,0 +1,61 @@
+## [Prometheus](https://github.com/prometheus/prometheus) and [node_exporter](https://github.com/prometheus/node_exporter)
+Dockcheck is capable to export metrics to prometheus via the text file collector provided by the node_exporter.
+In order to do so the -c flag has to be specified followed by the file path that is configured in the text file collector of the node_exporter.
+A simple cron job can be configured to export these metrics on a regular interval as shown in the sample below:
+
+```
+0 1 * * * /root/dockcheck.sh -n -c /var/lib/node_exporter/textfile_collector
+```
+
+The following metrics are exported to prometheus
+
+```
+# HELP dockcheck_images_analyzed Docker images that have been analyzed
+# TYPE dockcheck_images_analyzed gauge
+dockcheck_images_analyzed 22
+# HELP dockcheck_images_outdated Docker images that are outdated
+# TYPE dockcheck_images_outdated gauge
+dockcheck_images_outdated 7
+# HELP dockcheck_images_latest Docker images that are outdated
+# TYPE dockcheck_images_latest gauge
+dockcheck_images_latest 14
+# HELP dockcheck_images_error Docker images with analysis errors
+# TYPE dockcheck_images_error gauge
+dockcheck_images_error 1
+# HELP dockcheck_images_analyze_timestamp_seconds Last dockercheck run time
+# TYPE dockcheck_images_analyze_timestamp_seconds gauge
+dockcheck_images_analyze_timestamp_seconds 1737924029
+```
+
+Once those metrics are exported they can be used to define alarms as shown below
+
+```
+- alert: dockcheck_images_outdated
+  expr: sum by(instance) (dockcheck_images_outdated) > 0
+  for: 15s
+  labels:
+    severity: warning
+  annotations:
+    summary: "{{ $labels.instance }} has {{ $value }} outdated docker images."
+    description: "{{ $labels.instance }} has {{ $value }} outdated docker images."
+- alert: dockcheck_images_error
+  expr: sum by(instance) (dockcheck_images_error) > 0
+  for: 15s
+  labels:
+    severity: warning
+  annotations:
+    summary: "{{ $labels.instance }} has {{ $value }} docker images having an error."
+    description: "{{ $labels.instance }} has {{ $value }} docker images having an error."
+- alert: dockercheck_image_last_analyze
+  expr: (time() - dockcheck_images_analyze_timestamp_seconds) > (3600 * 24 * 3)
+  for: 15s
+  labels:
+    severity: warning
+  annotations:
+    summary: "{{ $labels.instance }} has not updated the dockcheck statistics for more than  3 days."
+    description: "{{ $labels.instance }} has not updated the dockcheck statistics for more than 3 days."
+```
+
+There is a reference Grafana dashboard in [grafana/grafana_dashboard.json](./grafana/grafana_dashboard.json).
+
+![](./grafana/grafana_dashboard.png)

addons/prometheus/grafana/grafana_dashboard.json

@@ -0,0 +1,382 @@
+{
+  "__inputs": [
+    {
+      "name": "DS_PROMETHEUS",
+      "label": "prometheus",
+      "description": "",
+      "type": "datasource",
+      "pluginId": "prometheus",
+      "pluginName": "Prometheus"
+    }
+  ],
+  "__elements": {},
+  "__requires": [
+    {
+      "type": "grafana",
+      "id": "grafana",
+      "name": "Grafana",
+      "version": "11.4.0"
+    },
+    {
+      "type": "datasource",
+      "id": "prometheus",
+      "name": "Prometheus",
+      "version": "1.0.0"
+    },
+    {
+      "type": "panel",
+      "id": "table",
+      "name": "Table",
+      "version": ""
+    }
+  ],
+  "annotations": {
+    "list": [
+      {
+        "builtIn": 1,
+        "datasource": {
+          "type": "grafana",
+          "uid": "-- Grafana --"
+        },
+        "enable": true,
+        "hide": true,
+        "iconColor": "rgba(0, 211, 255, 1)",
+        "name": "Annotations & Alerts",
+        "type": "dashboard"
+      }
+    ]
+  },
+  "editable": true,
+  "fiscalYearStartMonth": 0,
+  "graphTooltip": 0,
+  "id": null,
+  "links": [],
+  "panels": [
+    {
+      "datasource": {
+        "type": "prometheus",
+        "uid": "${DS_PROMETHEUS}"
+      },
+      "fieldConfig": {
+        "defaults": {
+          "color": {
+            "mode": "thresholds"
+          },
+          "custom": {
+            "align": "auto",
+            "cellOptions": {
+              "type": "auto"
+            },
+            "inspect": false
+          },
+          "mappings": [],
+          "thresholds": {
+            "mode": "absolute",
+            "steps": [
+              {
+                "color": "green",
+                "value": null
+              },
+              {
+                "color": "red",
+                "value": 80
+              }
+            ]
+          }
+        },
+        "overrides": [
+          {
+            "matcher": {
+              "id": "byName",
+              "options": "last_analyze_timestamp"
+            },
+            "properties": [
+              {
+                "id": "unit",
+                "value": "dateTimeAsIso"
+              }
+            ]
+          },
+          {
+            "matcher": {
+              "id": "byName",
+              "options": "last_analyze_since"
+            },
+            "properties": [
+              {
+                "id": "unit",
+                "value": "s"
+              },
+              {
+                "id": "custom.cellOptions",
+                "value": {
+                  "mode": "gradient",
+                  "type": "color-background"
+                }
+              },
+              {
+                "id": "thresholds",
+                "value": {
+                  "mode": "absolute",
+                  "steps": [
+                    {
+                      "color": "green",
+                      "value": null
+                    },
+                    {
+                      "color": "red",
+                      "value": 259200
+                    }
+                  ]
+                }
+              }
+            ]
+          },
+          {
+            "matcher": {
+              "id": "byName",
+              "options": "images_outdated"
+            },
+            "properties": [
+              {
+                "id": "custom.cellOptions",
+                "value": {
+                  "mode": "gradient",
+                  "type": "color-background"
+                }
+              },
+              {
+                "id": "thresholds",
+                "value": {
+                  "mode": "absolute",
+                  "steps": [
+                    {
+                      "color": "green",
+                      "value": null
+                    },
+                    {
+                      "color": "red",
+                      "value": 1
+                    }
+                  ]
+                }
+              }
+            ]
+          },
+          {
+            "matcher": {
+              "id": "byName",
+              "options": "images_error"
+            },
+            "properties": [
+              {
+                "id": "custom.cellOptions",
+                "value": {
+                  "mode": "gradient",
+                  "type": "color-background"
+                }
+              },
+              {
+                "id": "thresholds",
+                "value": {
+                  "mode": "absolute",
+                  "steps": [
+                    {
+                      "color": "green",
+                      "value": null
+                    },
+                    {
+                      "color": "red",
+                      "value": 1
+                    }
+                  ]
+                }
+              }
+            ]
+          }
+        ]
+      },
+      "gridPos": {
+        "h": 14,
+        "w": 24,
+        "x": 0,
+        "y": 0
+      },
+      "id": 2,
+      "options": {
+        "cellHeight": "sm",
+        "footer": {
+          "countRows": false,
+          "fields": "",
+          "reducer": [
+            "sum"
+          ],
+          "show": false
+        },
+        "frameIndex": 1,
+        "showHeader": true,
+        "sortBy": []
+      },
+      "pluginVersion": "11.4.0",
+      "targets": [
+        {
+          "disableTextWrap": false,
+          "editorMode": "code",
+          "exemplar": false,
+          "expr": "sum by(instance) (dockcheck_images_analyzed)",
+          "format": "table",
+          "fullMetaSearch": false,
+          "hide": false,
+          "includeNullMetadata": true,
+          "instant": true,
+          "interval": "",
+          "legendFormat": "{{instance}}",
+          "range": false,
+          "refId": "dockcheck_images_analyzed",
+          "useBackend": false,
+          "datasource": {
+            "type": "prometheus",
+            "uid": "${DS_PROMETHEUS}"
+          }
+        },
+        {
+          "datasource": {
+            "type": "prometheus",
+            "uid": "${DS_PROMETHEUS}"
+          },
+          "disableTextWrap": false,
+          "editorMode": "code",
+          "exemplar": false,
+          "expr": "sum by(instance) (dockcheck_images_outdated)",
+          "format": "table",
+          "fullMetaSearch": false,
+          "hide": false,
+          "includeNullMetadata": true,
+          "instant": true,
+          "legendFormat": "{{instance}}",
+          "range": false,
+          "refId": "dockcheck_images_outdated",
+          "useBackend": false
+        },
+        {
+          "datasource": {
+            "type": "prometheus",
+            "uid": "${DS_PROMETHEUS}"
+          },
+          "disableTextWrap": false,
+          "editorMode": "code",
+          "exemplar": false,
+          "expr": "sum by(instance) (dockcheck_images_latest)",
+          "format": "table",
+          "fullMetaSearch": false,
+          "hide": false,
+          "includeNullMetadata": true,
+          "instant": true,
+          "legendFormat": "{{instance}}",
+          "range": false,
+          "refId": "dockcheck_images_latest",
+          "useBackend": false
+        },
+        {
+          "datasource": {
+            "type": "prometheus",
+            "uid": "${DS_PROMETHEUS}"
+          },
+          "editorMode": "code",
+          "exemplar": false,
+          "expr": "sum by(instance) (dockcheck_images_error)",
+          "format": "table",
+          "hide": false,
+          "instant": true,
+          "legendFormat": "{{instance}}",
+          "range": false,
+          "refId": "dockcheck_images_error"
+        },
+        {
+          "datasource": {
+            "type": "prometheus",
+            "uid": "${DS_PROMETHEUS}"
+          },
+          "editorMode": "code",
+          "exemplar": false,
+          "expr": "dockcheck_images_analyze_timestamp_seconds * 1000",
+          "format": "table",
+          "hide": false,
+          "instant": true,
+          "legendFormat": "{{instance}}",
+          "range": false,
+          "refId": "dockcheck_images_analyze_timestamp_seconds"
+        },
+        {
+          "datasource": {
+            "type": "prometheus",
+            "uid": "${DS_PROMETHEUS}"
+          },
+          "editorMode": "code",
+          "exemplar": false,
+          "expr": "time() - dockcheck_images_analyze_timestamp_seconds",
+          "format": "table",
+          "hide": false,
+          "instant": true,
+          "legendFormat": "{{instance}}",
+          "range": false,
+          "refId": "dockcheck_images_last_analyze"
+        }
+      ],
+      "title": "Dockcheck Status",
+      "transformations": [
+        {
+          "id": "merge",
+          "options": {}
+        },
+        {
+          "id": "organize",
+          "options": {
+            "excludeByName": {
+              "Time": true,
+              "__name__": true,
+              "job": true
+            },
+            "includeByName": {},
+            "indexByName": {
+              "Time": 0,
+              "Value #dockcheck_images_analyze_timestamp_seconds": 2,
+              "Value #dockcheck_images_analyzed": 4,
+              "Value #dockcheck_images_error": 7,
+              "Value #dockcheck_images_last_analyze": 3,
+              "Value #dockcheck_images_latest": 5,
+              "Value #dockcheck_images_outdated": 6,
+              "instance": 1,
+              "job": 8
+            },
+            "renameByName": {
+              "Value #A": "analyze_timestamp",
+              "Value #dockcheck_images_analyze_timestamp_seconds": "last_analyze_timestamp",
+              "Value #dockcheck_images_analyzed": "images_analyzed",
+              "Value #dockcheck_images_error": "images_error",
+              "Value #dockcheck_images_last_analyze": "last_analyze_since",
+              "Value #dockcheck_images_latest": "images_latest",
+              "Value #dockcheck_images_outdated": "images_outdated"
+            }
+          }
+        }
+      ],
+      "type": "table"
+    }
+  ],
+  "schemaVersion": 40,
+  "tags": [],
+  "templating": {
+    "list": []
+  },
+  "time": {
+    "from": "now-6h",
+    "to": "now"
+  },
+  "timepicker": {},
+  "timezone": "browser",
+  "title": "Dockcheck Status",
+  "uid": "feb4pv3kv1hxca",
+  "version": 17,
+  "weekStart": ""
+}

addons/prometheus/prometheus_collector.sh

@@ -0,0 +1,28 @@
+prometheus_exporter() {
+  checkedImages=$(($1 + $2 + $3))
+  checkTimestamp=$(date +%s)
+  
+  promFileContent=()
+  promFileContent+=("# HELP dockcheck_images_analyzed Docker images that have been analyzed")
+  promFileContent+=("# TYPE dockcheck_images_analyzed gauge")
+  promFileContent+=("dockcheck_images_analyzed $checkedImages")
+  
+  promFileContent+=("# HELP dockcheck_images_outdated Docker images that are outdated")
+  promFileContent+=("# TYPE dockcheck_images_outdated gauge")
+  promFileContent+=("dockcheck_images_outdated ${#GotUpdates[@]}")
+
+  promFileContent+=("# HELP dockcheck_images_latest Docker images that are outdated")
+  promFileContent+=("# TYPE dockcheck_images_latest gauge")
+  promFileContent+=("dockcheck_images_latest ${#NoUpdates[@]}")
+  
+  promFileContent+=("# HELP dockcheck_images_error Docker images with analysis errors")
+  promFileContent+=("# TYPE dockcheck_images_error gauge")
+  promFileContent+=("dockcheck_images_error ${#GotErrors[@]}")
+  
+  promFileContent+=("# HELP dockcheck_images_analyze_timestamp_seconds Last dockercheck run time")
+  promFileContent+=("# TYPE dockcheck_images_analyze_timestamp_seconds gauge")
+  promFileContent+=("dockcheck_images_analyze_timestamp_seconds $checkTimestamp")
+  
+  printf "%s\n" "${promFileContent[@]}" > "$CollectorTextFileDirectory/dockcheck_info.prom\$\$"
+  mv -f "$CollectorTextFileDirectory/dockcheck_info.prom\$\$" "$CollectorTextFileDirectory/dockcheck_info.prom"
+}

dockcheck.sh

@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
-VERSION="v0.5.3.0"
-### ChangeNotes: Bugfixes - local image check changed, Gotify-template fixed
+VERSION="v0.5.6.0"
+### ChangeNotes: Heavily improved performance due to asynchronous update checks. 
 Github="https://github.com/mag37/dockcheck"
 RawUrl="https://raw.githubusercontent.com/mag37/dockcheck/main/dockcheck.sh"
 
@@ -20,6 +20,7 @@ Help() {
   echo
   echo "Options:"
   echo "-a|y   Automatic updates, without interaction."
+  echo "-c     Exports metrics as prom file for the prometheus node_exporter. Provide the collector textfile directory."
   echo "-d N   Only update to new images that are N+ days old. Lists too recent with +prefix and age. 2xSlower."
   echo "-e X   Exclude containers, separated by comma."
   echo "-f     Force stack restart after update. Caution: restarts once for every updated container within stack."
@@ -45,11 +46,14 @@ c_blue="\033[0;34m"
 c_teal="\033[0;36m"
 c_reset="\033[0m"
 
+MaxAsync=32
 Timeout=10
 Stopped=""
-while getopts "aynpfrhlisvme:d:t:" options; do
+while getopts "aynpfrhlisvmc:e:d:t:" options; do
   case "${options}" in
     a|y) AutoUp="yes" ;;
+    c)   CollectorTextFileDirectory="${OPTARG}"
+         if ! [[ -d  $CollectorTextFileDirectory ]] ; then { printf "The directory (%s) does not exist.\n" "${CollectorTextFileDirectory}"  ; exit 2; } fi ;;
     n)   AutoUp="no" ;;
     r)   DRunUp="yes" ;;
     p)   AutoPrune="yes" ;;
@@ -128,7 +132,8 @@ choosecontainers() {
 
 datecheck() {
   ImageDate=$($regbin -v error image inspect "$RepoUrl" --format='{{.Created}}' | cut -d" " -f1 )
-  ImageAge=$(( ( $(date +%s) - $(date -d "$ImageDate" +%s) )/86400 ))
+  ImageEpoch=$(date -d "$ImageDate" +%s 2>/dev/null) || ImageEpoch=$(date -f "%Y-%m-%d" -j "$ImageDate" +%s)
+  ImageAge=$(( ( $(date +%s) - $ImageEpoch )/86400 ))
   if [ "$ImageAge" -gt "$DaysOld" ] ; then
     return 0
   else
@@ -177,7 +182,7 @@ IFS=',' read -r -a Excludes <<< "$Exclude" ; unset IFS
 binary_downloader() {
   BinaryName="$1"
   BinaryUrl="$2"
-  case "$(uname --machine)" in
+  case "$(uname -m)" in
     x86_64|amd64) architecture="amd64" ;;
     arm64|aarch64) architecture="arm64";;
     *) printf "\n%bArchitecture not supported, exiting.%b\n" "$c_red" "$c_reset" ; exit 1;;
@@ -192,49 +197,49 @@ binary_downloader() {
 
 distro_checker() {
   if [[ -f /etc/arch-release ]] ; then PkgInstaller="pacman -S"
-  elif [[ -f /etc/redhat-release ]] ; then PkgInstaller="dnf install"
-  elif [[ -f /etc/SuSE-release ]] ; then PkgInstaller="zypper install"
-  elif [[ -f /etc/debian_version ]] ; then PkgInstaller="apt-get install"
+  elif [[ -f /etc/redhat-release ]] ; then PkgInstaller="sudo dnf install"
+  elif [[ -f /etc/SuSE-release ]] ; then PkgInstaller="sudo zypper install"
+  elif [[ -f /etc/debian_version ]] ; then PkgInstaller="sudo apt-get install"
+  elif [[ $(uname -s) == "Darwin" ]] ; then PkgInstaller="brew install"
   else PkgInstaller="ERROR" ; printf "\n%bNo distribution could be determined%b, falling back to static binary.\n" "$c_yellow" "$c_reset"
   fi
 }
 
-# Dependency check for jq in PATH or directory
-if [[ $(command -v jq) ]]; then jqbin="jq" ;
-elif [[ -f "$ScriptWorkDir/jq" ]]; then jqbin="$ScriptWorkDir/jq" ;
+# Dependency check + installer function
+dependency_check() {
+  AppName="$1"
+  AppVar="$2"
+  AppUrl="$3"
+  if [[ $(command -v $AppName) ]]; then export $AppVar="$AppName" ;
+  elif [[ -f "$ScriptWorkDir/$AppName" ]]; then export $AppVar="$ScriptWorkDir/$AppName" ;
   else
-  printf "%s\n" "Required dependency 'jq' missing, do you want to install it?"
-  read -r -p "y: With packagemanager (sudo). / s: Download static binary. y/s/[n] " GetJq
-  GetJq=${GetJq:-no} # set default to no if nothing is given
-  if [[ "$GetJq" =~ [yYsS] ]] ; then
-    [[ "$GetJq" =~ [yY] ]] && distro_checker
+    printf "%s\n" "Required dependency '$AppName' missing, do you want to install it?"
+    read -r -p "y: With packagemanager (sudo). / s: Download static binary. y/s/[n] " GetBin
+    GetBin=${GetBin:-no} # set default to no if nothing is given
+    if [[ "$GetBin" =~ [yYsS] ]] ; then
+      [[ "$GetBin" =~ [yY] ]] && distro_checker
       if [[ -n "$PkgInstaller" && "$PkgInstaller" != "ERROR" ]] ; then
-      (sudo $PkgInstaller jq) ; PkgExitcode="$?"
-      [[ "$PkgExitcode" == 0 ]] && jqbin="jq" || printf "\n%bPackagemanager install failed%b, falling back to static binary.\n" "$c_yellow" "$c_reset"
+        [[ $(uname -s) == "Darwin" && "$AppName" == "regctl" ]] && AppName="regclient"
+        ($PkgInstaller $AppName) ; PkgExitcode="$?" && AppName="$1"
+        if [[ "$PkgExitcode" == 0 ]] ; then { export $AppVar="$AppName" && printf "\n%b$AppName installed.%b\n" "$c_green" "$c_reset"; }
+        else printf "\n%bPackagemanager install failed%b, falling back to static binary.\n" "$c_yellow" "$c_reset"
         fi
-    if [[ "$GetJq" =~ [nN] || "$PkgInstaller" == "ERROR" || "$PkgExitcode" != 0 ]] ; then
-        binary_downloader "jq" "https://github.com/jqlang/jq/releases/latest/download/jq-linux-TEMP"
-        [[ -f "$ScriptWorkDir/jq" ]] && jqbin="$ScriptWorkDir/jq" 
+      fi
+      if [[ "$GetBin" =~ [sS] || "$PkgInstaller" == "ERROR" || "$PkgExitcode" != 0 ]] ; then
+          binary_downloader "$AppName" "$AppUrl"
+          [[ -f "$ScriptWorkDir/$AppName" ]] && { export $AppVar="$ScriptWorkDir/$1" && printf "\n%b$AppName downloaded.%b\n" "$c_green" "$c_reset"; }
       fi
     else printf "\n%bDependency missing, exiting.%b\n" "$c_red" "$c_reset" ; exit 1 ;
     fi
   fi
   # Final check if binary is correct
-$jqbin --version &> /dev/null  || { printf "%s\n" "jq is not working - try to remove it and re-download it, exiting."; exit 1; }
+  [[ "$1" == "jq" ]] && VerFlag="--version"
+  [[ "$1" == "regctl" ]] && VerFlag="version"
+  ${!AppVar} $VerFlag &> /dev/null  || { printf "%s\n" "$AppName is not working - try to remove it and re-download it, exiting."; exit 1; }
+}
 
-# Dependency check for regctl in PATH or directory
-if [[ $(command -v regctl) ]]; then regbin="regctl" ;
-elif [[ -f "$ScriptWorkDir/regctl" ]]; then regbin="$ScriptWorkDir/regctl" ;
-else
-  read -r -p "Required dependency 'regctl' missing, do you want it downloaded? y/[n] " GetRegctl
-  if [[ "$GetRegctl" =~ [yY] ]] ; then
-    binary_downloader "regctl" "https://github.com/regclient/regclient/releases/latest/download/regctl-linux-TEMP"
-    [[ -f "$ScriptWorkDir/regctl" ]] && regbin="$ScriptWorkDir/regctl" 
-  else printf "\n%bDependency missing, exiting.%b\n" "$c_red" "$c_reset" ; exit 1 ;
-  fi
-fi
-# Final check if binary is correct
-$regbin version &> /dev/null  || { printf "%s\n" "regctl is not working - try to remove it and re-download it, exiting."; exit 1; }
+dependency_check "regctl" "regbin" "https://github.com/regclient/regclient/releases/latest/download/regctl-linux-TEMP"
+dependency_check "jq" "jqbin" "https://github.com/jqlang/jq/releases/latest/download/jq-linux-TEMP"
 
 # Check docker compose binary
 if docker compose version &> /dev/null ; then DockerBin="docker compose" ;
@@ -278,31 +283,70 @@ if [[ $t_out ]]; then
 else t_out=""
 fi
 
-# Check the image-hash of every running container VS the registry
-for i in $(docker ps $Stopped --filter "name=$SearchName" --format '{{.Names}}') ; do
-  ((RegCheckQue+=1))
-  progress_bar "$RegCheckQue" "$ContCount"
-  # Looping every item over the list of excluded names and skipping
-  for e in "${Excludes[@]}" ; do [[ "$i" == "$e" ]] && continue 2 ; done
+check_image() {
+  i="$1"
+  local Excludes=($Excludes_string)
+  for e in "${Excludes[@]}" ; do 
+    if [[ "$i" == "$e" ]]; then
+      echo Skip $i
+      return
+    fi
+  done
+
+  local NoUpdates GotUpdates GotErrors
   ImageId=$(docker inspect "$i" --format='{{.Image}}')
   RepoUrl=$(docker inspect "$i" --format='{{.Config.Image}}')
   LocalHash=$(docker image inspect "$ImageId" --format '{{.RepoDigests}}')
+
   # Checking for errors while setting the variable
   if RegHash=$(${t_out} $regbin -v error image digest --list "$RepoUrl" 2>&1) ; then
     if [[ "$LocalHash" = *"$RegHash"* ]] ; then
-      NoUpdates+=("$i")
+      echo NoUpdates "$i"
     else
       if [[ -n "$DaysOld" ]] && ! datecheck ; then
-        NoUpdates+=("+$i ${ImageAge}d")
+        echo NoUpdates "+$i ${ImageAge}d"
       else
-        GotUpdates+=("$i")
+        echo GotUpdates "$i"
       fi
     fi
   else
     # Here the RegHash is the result of an error code
-    GotErrors+=("$i - ${RegHash}")
+    echo GotErrors "$i - ${RegHash}"
   fi
-done
+}
+
+# Make required functions and variables available to subprocesses
+export -f check_image datecheck
+export Excludes_string="${Excludes[@]}" # Can only export scalar variables
+export t_out regbin RepoUrl DaysOld
+
+# Check for POSIX xargs with -P option, fallback without async 
+if (echo "test" | xargs -P 10 >/dev/null 2>&1)  ; then
+  XargsAsync="-P $MaxAsync"
+else
+  XargsAsync=""
+  printf "%bMissing POSIX xargs, consider installing 'findutils' for asynchronous lookups.%b\n" "$c_red" "$c_reset"
+fi
+
+# Asynchronously check the image-hash of every running container VS the registry
+while read -r line; do
+  ((RegCheckQue+=1))
+  progress_bar "$RegCheckQue" "$ContCount"
+
+  Got=${line%% *}  # Extracts the first word (NoUpdates, GotUpdates, GotErrors)
+  item=${line#* }
+
+  case "$Got" in
+    NoUpdates) NoUpdates+=("$item") ;;
+    GotUpdates) GotUpdates+=("$item") ;;
+    GotErrors) GotErrors+=("$item") ;;
+    Skip) ;;
+    *) echo "Error! Unexpected output from subprocess: ${line}" ;;
+  esac
+done < <( \
+  docker ps $Stopped --filter "name=$SearchName" --format '{{.Names}}' | \
+  xargs ${XargsAsync} -I {} bash -c 'check_image "{}"' \
+)
 
 # Sort arrays alphabetically
 IFS=$'\n'
@@ -310,6 +354,11 @@ NoUpdates=($(sort <<<"${NoUpdates[*]}"))
 GotUpdates=($(sort <<<"${GotUpdates[*]}"))
 unset IFS
 
+# Run the prometheus exporter function
+if [ -n "$CollectorTextFileDirectory" ] ; then
+  source "$ScriptWorkDir"/addons/prometheus/prometheus_collector.sh && prometheus_exporter ${#NoUpdates[@]} ${#GotUpdates[@]} ${#GotErrors[@]}
+fi
+
 # Define how many updates are available
 UpdCount="${#GotUpdates[@]}"