bundles/minecraft: add monitoring via telegraf

bundles/minecraft/items.py

@@ -1,5 +1,8 @@
 from json import dumps
 
+JOLOKIA_VERSION = '1.7.1'
+JOLOKIA_SHA1 = 'd9cf8215598480c98c03a2409344aba20d29884b'
+
 java_opts = set()
 
 for k, v in node.metadata.get('minecraft/java_opts').items():
@@ -8,6 +11,7 @@ for k, v in node.metadata.get('minecraft/java_opts').items():
     else:
         java_opts.add(f'{k}={v}')
 
+# World
 directories['/home/minecraft/world'] = {
     'owner': 'minecraft',
     'group': 'minecraft',
@@ -23,6 +27,7 @@ directories['/home/minecraft/world_the_end'] = {
     'group': 'minecraft',
 }
 
+# The actual server
 files['/usr/local/lib/systemd/system/minecraft.service'] = {
     'content_type': 'mako',
     'context': {
@@ -41,6 +46,9 @@ files['/home/minecraft/eula.txt'] = {
 files['/home/minecraft/server.properties'] = {
     # get it from data/minecraft/files/{node.name}
     'source': node.name,
+    'triggers': {
+        'svc_systemd:minecraft:restart',
+    },
 }
 
 version, build_nr = node.metadata.get('minecraft/version')
@@ -49,6 +57,9 @@ files['/home/minecraft/minecraft_server.jar'] = {
     'content_type': 'download',
     'source': f'https://api.papermc.io/v2/projects/paper/versions/{version}/builds/{build_nr}/downloads/paper-{version}-{build_nr}.jar',
     'content_hash': node.metadata.get('minecraft/sha1', None),
+    'triggers': {
+        'svc_systemd:minecraft:restart',
+    },
 }
 
 svc_systemd['minecraft'] = {
@@ -64,6 +75,7 @@ svc_systemd['minecraft'] = {
     },
 }
 
+# Permissions
 files['/home/minecraft/ops.json'] = {
     'content': dumps(
         [
@@ -74,7 +86,10 @@ files['/home/minecraft/ops.json'] = {
             } for name, uuid in sorted(node.metadata.get('minecraft/ops', {}).items())
         ],
         indent=4,
-    )
+    ),
+    'triggers': {
+        'svc_systemd:minecraft:restart',
+    },
 }
 
 if node.metadata.get('minecraft/allowlist', {}):
@@ -87,5 +102,18 @@ if node.metadata.get('minecraft/allowlist', {}):
                 } for name, uuid in sorted(node.metadata.get('minecraft/allowlist').items())
             ],
             indent=4,
-        )
+        ),
+        'triggers': {
+            'svc_systemd:minecraft:restart',
+        },
     }
+
+# Monitoring
+files['/home/minecraft/jolokia.jar'] = {
+    'source': f'https://search.maven.org/remotecontent?filepath=org/jolokia/jolokia-jvm/{JOLOKIA_VERSION}/jolokia-jvm-{JOLOKIA_VERSION}.jar',
+    'content_type': 'download',
+    'content_hash': JOLOKIA_SHA1,
+    'triggers': {
+        'svc_systemd:minecraft:restart',
+    },
+}

bundles/minecraft/metadata.py

@@ -33,6 +33,62 @@ defaults = {
             '-XX:MaxGCPauseMillis': 200,
             '-XX:MaxTenuringThreshold': 1,
             '-XX:SurvivorRatio': 32,
+            '-javaagent:/home/minecraft/jolokia.jar=port=25576,host=localhost': None,
+        },
+    },
+    'telegraf': {
+        'input_plugins': {
+            'builtin': {
+                'jolokia2_agent': [{
+                    'urls': ['http://localhost:25576/jolokia'],
+                    'metric': [
+                        {
+                            'name': 'minecraft_tick',
+                            'mbean': 'net.minecraft.server:type=Server',
+                            'paths': [
+                                'averageTickTime',
+                            ],
+                        },
+                        {
+                            'name': 'minecraft_memory',
+                            'mbean': 'java.lang:type=Memory',
+                            'paths': [
+                                'HeapMemoryUsage',
+                                'NonHeapMemoryUsage',
+                                'ObjectPendingFinalizationCount',
+                            ],
+                        },
+                        {
+                            'name': 'minecraft_gc',
+                            'mbean': 'java.lang:name=*,type=GarbageCollector',
+                            'paths': [
+                                'CollectionTime',
+                                'CollectionCount',
+                            ],
+                            'tag_keys': ['name'],
+                        },
+                        {
+                            'name': 'minecraft_mempool',
+                            'mbean': 'java.lang:name=*,type=MemoryPool',
+                            'paths': [
+                                'CollectionUsage',
+                                'PeakUsage',
+                                'Usage',
+                            ],
+                            'tag_keys': ['name'],
+                        },
+                        {
+                            'name': 'minecraft_os',
+                            'mbean': 'java.lang:type=OperatingSystem',
+                            'paths': [
+                                'OpenFileDescriptorCount',
+                                'ProcessCpuLoad',
+                                'ProcessCpuTime',
+                            ],
+                        },
+                    ],
+                }],
+            },
         },
     },
     'users': {

data/minecraft/files/rx300

@@ -7,7 +7,7 @@ broadcast-rcon-to-ops=true
 debug=false
 difficulty=easy
 enable-command-block=false
-enable-jmx-monitoring=false
+enable-jmx-monitoring=true
 enable-query=false
 enable-rcon=true
 enable-status=true