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mod_measure_modules: Report module statuses via OpenMetrics Someone in the chat asked about a health check endpoint, which reminded me of mod_http_status, which provides access to module statuses with full details. After that, this idea came about, which seems natural. As noted in the README, it could be used to monitor that critical modules are in fact loaded correctly. As more modules use the status API, the more useful this module and mod_http_status becomes.
author Kim Alvefur <zash@zash.se>
date Fri, 06 Oct 2023 18:34:39 +0200
parents f95a1e197a07
children
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# XEP-0283: Moved

[Client] Romeo
	jid: romeo1@localhost
	password: password

[Client] RomeoNew
	jid: romeo.new@localhost
	password: password

[Client] Juliet
	jid: juliet.m@localhost
	password: password

-----

# The parties connect
Romeo connects

Romeo sends:
	<presence/>

Romeo receives:
	<presence from="${Romeo's full JID}"/>

Juliet connects

Juliet sends:
	<presence/>

Juliet receives:
	<presence from="${Juliet's full JID}"/>

RomeoNew connects

RomeoNew sends:
	<presence/>

RomeoNew receives:
	<presence from="${RomeoNew's full JID}"/>

# They add each other
Romeo sends:
	<presence type="subscribe" to="${Juliet's JID}"/>

Romeo receives:
	<presence from="${Juliet's JID}" to="${Romeo's JID}" type="unavailable"/>

Juliet receives:
	<presence type="subscribe" to="${Juliet's JID}" from="${Romeo's JID}"/>

Juliet sends:
	<presence type="subscribed" to="${Romeo's JID}"/>

Romeo receives:
	<presence from="${Juliet's full JID}" to="${Romeo's JID}">
	  <delay xmlns="urn:xmpp:delay" stamp="{scansion:any}" from="localhost"/>
	</presence>

Juliet sends:
	<presence type="subscribe" to="${Romeo's JID}"/>

Juliet receives:
	<presence from="${Romeo's JID}" to="${Juliet's JID}" type="unavailable"/>

Romeo receives:
	<presence type="subscribe" to="${Romeo's JID}" from="${Juliet's JID}"/>

Romeo sends:
	<presence type="subscribed" to="${Juliet's JID}"/>

Juliet receives:
	<presence from="${Romeo's full JID}" to="${Juliet's JID}">
	  <delay xmlns="urn:xmpp:delay" stamp="{scansion:any}" from="localhost"/>
	</presence>

Romeo receives:
	<presence from="${Juliet's full JID}" to="${Romeo's JID}">
	  <delay xmlns="urn:xmpp:delay" stamp="{scansion:any}" from="localhost"/>
	</presence>

# They request their rosters

Juliet sends:
	<iq type="get" id="roster1">
		<query xmlns='jabber:iq:roster'/>
	</iq>

Juliet receives:
	<iq type="result" id="roster1"/>

RomeoNew sends:
	<iq type="get" id="roster1">
		<query xmlns='jabber:iq:roster'/>
	</iq>

RomeoNew receives:
	<iq type="result" id="roster1"/>

# They can now talk
Juliet sends:
	<message type="chat" to="${Romeo's JID}">
	  <body>ohai</body>
	</message>

Romeo receives:
	<message type="chat" to="${Romeo's JID}" from="${Juliet's full JID}">
	  <body>ohai</body>
	</message>

# Romeo moves to a new account

# Romeo publishes a moved statement

Romeo sends:
	<iq type='set' id='pub1'>
		<pubsub xmlns='http://jabber.org/protocol/pubsub'>
			<publish node='urn:xmpp:moved:1'>
				<item id='current'>
					<moved xmlns='urn:xmpp:moved:1'>
						<new-jid>${RomeoNew's JID}</new-jid>
					</moved>
				</item>
			</publish>
			<publish-options>
				<x xmlns='jabber:x:data' type='submit'>
					<field var='FORM_TYPE' type='hidden'>
						<value>http://jabber.org/protocol/pubsub#publish-options</value>
					</field>
					<field var='pubsub#access_model'>
						<value>open</value>
					</field>
				</x>
			</publish-options>
		</pubsub>
	</iq>

Romeo receives:
	<iq type="result" id="pub1">
		<pubsub xmlns='http://jabber.org/protocol/pubsub'>
			<publish node='urn:xmpp:moved:1'>
				<item id='current'/>
			</publish>
		</pubsub>
	</iq>



# RomeoNew sends moved notification to Juliet
RomeoNew sends:
	<presence type="subscribe" to="${Juliet's JID}">
		<moved xmlns="urn:xmpp:moved:1">
			<old-jid>${Romeo's JID}</old-jid>
		</moved>
	</presence>

RomeoNew receives:
	<iq type='set' id="{scansion:any}">
		<query ver="{scansion:any}" xmlns='jabber:iq:roster'>
			<item jid="${Juliet's JID}" subscription='none' ask='subscribe'/>
		</query>
	</iq>

# Juliet's server verifies and approves the subscription request

RomeoNew receives:
	<presence type="subscribed" from="${Juliet's JID}"/>

RomeoNew receives:
	<iq type='set' id="{scansion:any}">
		<query ver="{scansion:any}" xmlns='jabber:iq:roster'>
			<item jid="${Juliet's JID}" subscription='to' />
		</query>
	</iq>

# Juliet's server notifies her via a roster push

Juliet receives:
	<iq type="set" id="{scansion:any}">
		<query xmlns='jabber:iq:roster' ver='{scansion:any}'>
			<item jid="${RomeoNew's JID}" subscription='from'/>
		</query>
	</iq>