prepare 3.1.0 release, continued

Signed-off-by: Thomas Jaeckle <thomas.jaeckle@bosch.io>

RELEASE.md

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+# Releasing Eclipse Ditto
+
+Perform the following steps
+
+## Plan the release **upfront** via the Eclipse projects page
+
+Ditto releases are tracked and planned here: https://projects.eclipse.org/projects/iot.ditto/releases/
+
+## Build Ditto release
+
+* build Jenkins Ditto release job: https://ci.eclipse.org/ditto/
+* After release was pushed on https://oss.sonatype.org:
+   * (old way - should no longer be required starting with Ditto 3.1.0) Ditto artifacts are in a "Staging repositories" (which some of the team members have access to, e.g. Thomas, Dominik, Gerald, Johannes, ...): 
+      * First close the staging repo (after all artifacts are there, e.g. also the client artifacts)
+      * Then release the staging repo
+      * Then it will take a few hours until those changes are synced successfully to Maven central
+* Write Release notes, e.g. like for 3.0.0: https://www.eclipse.org/ditto/release_notes_310.html
+   * New features, changes, bug fixes to last release / milestone release
+   * Add migration notes (if there are any)
+* Write a Blog post announcement, e.g. like for: https://www.eclipse.org/ditto/2022-12-15-release-announcement-310.html
+* Close GitHub milestone (and assign all Issues/PRs which were still included in that milestone): https://github.com/eclipse/ditto/milestones
+* Create a GitHub release: https://github.com/eclipse/ditto/releases (based on the Tags which was pushed during release job)
+* Write a mail to the "ditto-dev" mailing list
+* Tweet about it ;)
+* Set binary compatibility check version to the new public release. Delete all exclusions and module-level deactivation of japi-cmp plugin except for *.internal packages.
+* Update https://github.com/eclipse/ditto/blob/master/SECURITY.md with the supported versions to receive security fixes
+* For major+minor versions:
+   * Create a "release" branch"release-<version>" from the released git tag
+      * needed to build the documentation from
+      * required for bugfixes to build a bugfix release for the affected minor version
+   * Add the new version to the documentation config: https://github.com/eclipse/ditto/blob/master/documentation/src/main/resources/_config.yml#L114
+   * Adjust the "website" CI jobs to also build the newly added branch:
+      * https://ci.eclipse.org/ditto/view/Website/
+         * https://ci.eclipse.org/ditto/view/Website/job/website-build-and-deploy-fast/ will build the latest released minor version + "master" (development) version
+         * https://ci.eclipse.org/ditto/view/Website/job/website-build-and-deploy-full/ will build documentation for all Ditto versions ever created - and will take very long
+      * Adjust the Jenkins scripts via the Jenkins UI ("Configure") to checkout the new branch + build the docs from + zip it, unzip it, etc

deployment/operations/grafana-dashboards/Akka.json

@@ -0,0 +1,197 @@
+{
+  "annotations": {
+    "list": [
+      {
+        "builtIn": 1,
+        "datasource": {
+          "type": "datasource",
+          "uid": "grafana"
+        },
+        "enable": true,
+        "hide": true,
+        "iconColor": "rgba(0, 211, 255, 1)",
+        "name": "Annotations & Alerts",
+        "target": {
+          "limit": 100,
+          "matchAny": false,
+          "tags": [],
+          "type": "dashboard"
+        },
+        "type": "dashboard"
+      }
+    ]
+  },
+  "editable": true,
+  "fiscalYearStartMonth": 0,
+  "graphTooltip": 0,
+  "iteration": 1657123032364,
+  "links": [],
+  "liveNow": false,
+  "panels": [
+    {
+      "datasource": {
+        "type": "prometheus",
+        "uid": "P1809F7CD0C75ACF3"
+      },
+      "description": "",
+      "fieldConfig": {
+        "defaults": {
+          "color": {
+            "mode": "palette-classic"
+          },
+          "custom": {
+            "axisLabel": "",
+            "axisPlacement": "auto",
+            "barAlignment": 0,
+            "drawStyle": "line",
+            "fillOpacity": 10,
+            "gradientMode": "none",
+            "hideFrom": {
+              "legend": false,
+              "tooltip": false,
+              "viz": false
+            },
+            "lineInterpolation": "stepAfter",
+            "lineWidth": 1,
+            "pointSize": 5,
+            "scaleDistribution": {
+              "type": "linear"
+            },
+            "showPoints": "never",
+            "spanNulls": false,
+            "stacking": {
+              "group": "A",
+              "mode": "none"
+            },
+            "thresholdsStyle": {
+              "mode": "off"
+            }
+          },
+          "mappings": [],
+          "thresholds": {
+            "mode": "absolute",
+            "steps": [
+              {
+                "color": "green",
+                "value": null
+              }
+            ]
+          },
+          "unit": "short"
+        },
+        "overrides": []
+      },
+      "gridPos": {
+        "h": 12,
+        "w": 24,
+        "x": 0,
+        "y": 0
+      },
+      "id": 2,
+      "options": {
+        "legend": {
+          "calcs": [
+            "lastNotNull"
+          ],
+          "displayMode": "table",
+          "placement": "right",
+          "sortBy": "Last *",
+          "sortDesc": true
+        },
+        "tooltip": {
+          "mode": "multi",
+          "sort": "desc"
+        }
+      },
+      "pluginVersion": "8.5.6",
+      "targets": [
+        {
+          "expr": "actor_mailbox_size{service=~\"$service\", instance=~\"$instance\"}",
+          "interval": "",
+          "legendFormat": "{{service}}-{{actor_class}}",
+          "queryType": "randomWalk",
+          "refId": "A"
+        }
+      ],
+      "title": "# of messages in mailbox",
+      "type": "timeseries"
+    }
+  ],
+  "refresh": false,
+  "schemaVersion": 36,
+  "style": "dark",
+  "tags": [],
+  "templating": {
+    "list": [
+      {
+        "current": {
+          "isNone": true,
+          "selected": false,
+          "text": "None",
+          "value": ""
+        },
+        "datasource": {
+          "type": "prometheus",
+          "uid": "P1809F7CD0C75ACF3"
+        },
+        "definition": "label_values(actor_mailbox_size, service)",
+        "hide": 0,
+        "includeAll": false,
+        "multi": true,
+        "name": "service",
+        "options": [],
+        "query": {
+          "query": "label_values(actor_mailbox_size, service)",
+          "refId": "prometheus-service-Variable-Query"
+        },
+        "refresh": 1,
+        "regex": "",
+        "skipUrlSync": false,
+        "sort": 0,
+        "tagValuesQuery": "",
+        "tagsQuery": "",
+        "type": "query",
+        "useTags": false
+      },
+      {
+        "current": {
+          "selected": false,
+          "text": "All",
+          "value": "$__all"
+        },
+        "datasource": {
+          "type": "prometheus",
+          "uid": "P1809F7CD0C75ACF3"
+        },
+        "definition": "label_values(actor_mailbox_size{service=~\"$service\"}, instance)",
+        "hide": 0,
+        "includeAll": true,
+        "multi": true,
+        "name": "instance",
+        "options": [],
+        "query": {
+          "query": "label_values(actor_mailbox_size{service=~\"$service\"}, instance)",
+          "refId": "prometheus-instance-Variable-Query"
+        },
+        "refresh": 1,
+        "regex": "",
+        "skipUrlSync": false,
+        "sort": 0,
+        "tagValuesQuery": "",
+        "tagsQuery": "",
+        "type": "query",
+        "useTags": false
+      }
+    ]
+  },
+  "time": {
+    "from": "now-30m",
+    "to": "now"
+  },
+  "timepicker": {},
+  "timezone": "",
+  "title": "Akka",
+  "uid": "HQzg96fMz",
+  "version": 5,
+  "weekStart": ""
+}