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Dynatrace upgrade from 6.5 to 7.1 Doubts/Queries?


We're migrating from 6.5 to 7.1 version and this is the first time Im working on migration so I have few queries. Kindly help me understand.

1. Is it mandatory to deactivate license 6.5 before upgrading the license for a trial version?

Cant we directly upgrade it and use the upgraded license?

2. Currently our Dynatrace server( we have installed the full package) has collector and agents connect to it. I read that 7.1 doesnt support embedded Collectors? Is thsi full install package of teh server called embedded collector??
Which means agents will no more connect to dynatrace server in 7.1 version?

3. I did not deactivate the license and did a upgrade of teh license and Im using 7.1 evaluation license which was generated for the 7.1 upgraded server.

I notice that some collectors dont come online after the collectors are upgraded.

And after I apply teh update none of the collectors come online. I dont see any error in teh logs of teh collectors as well.
Can someone help me understand why this is?

Attached scrennshot and logs below

2018-07-25 06:23:26 INFO [CollectorConfigManager] Collector configuration stored.
2018-07-25 06:23:26 INFO [AgentListener] Starting AgentListenerServiceFactory with a maximum size of 500
2018-07-25 06:23:26 INFO [CollectorAccess] Updating peer collector list: [|]
2018-07-25 06:35:24 INFO [Collector] Server[] has been disconnected - reconnecting in 15s
2018-07-25 06:35:24 INFO [DefaultSessionManager] successfully closed session
2018-07-25 06:35:29 WARNING [ClusterTimeProvider] Exception synchronizing cluster time: COMMUNICATION_ERROR [log message will be suppressed for 1 hours]
2018-07-25 06:35:39 INFO [Collector] connecting to server at ''...
2018-07-25 06:50:02 INFO [CollectorSideFixpackSynchronizer] Starting update synchronization with Dynatrace Server
2018-07-25 06:50:03 INFO [CollectorSideFixpackSynchronizer] Finished update synchronization with Dynatrace Server
2018-07-25 06:50:03 INFO [com.dynatrace.diagnostics.a.o] Instrumentation caching enabled
2018-07-25 06:50:03 INFO [DefaultSessionManager] successfully created session:
2018-07-25 06:50:06 INFO [InstrumentationGlobalRulesetStorage] Sensor Removed:
2018-07-25 06:50:06 INFO [Discovery] Sensor plugin "" was successfully installed.
2018-07-25 06:50:06 INFO [CollectorConfigManager] Sensor order configurations stored successfully
2018-07-25 06:50:06 INFO [CollectorConfigManager] Collector configuration stored.dynt-coll-offline.png (After update all collectors become offline)