No data after upgrading from v2 to v3

After updating loraserver from 2.xx to latest 3.2.1 it stopped to receive any events published from lora_gatewaybridge.
Before updating it worked in following way:

msg="backend/gateway: connected to mqtt server"
msg="gateway/mqtt: subscribing to rx topic" qos=0 topic=gateway/+/rx
msg="gateway/mqtt: subscribing to stats topic" qos=0 topic=gateway/+/stats
msg="backend/gateway: subscribing to ack topic" qos=0 topic=gateway/+/ack
msg="migrations applied" count=0
msg="starting api server" bind="0.0.0.0:8000" ca-cert= tls-cert= tls-key=
msg="starting downlink device-queue scheduler"
msg="starting multicast scheduler"

So it was able to receive gatewaybridge's events:

msg="backend: publishing packet" qos=0 topic=gateway/aa555a0000000005/stats
msg="backend: publishing packet" qos=0 topic=gateway/aa555a0000000005/rx

But after update it does just this:

msg="gateway/mqtt: connecting to mqtt broker" server="tcp://lora_mosquitto:1883"
msg="connecting to geolocation-server" ca_cert= server="lora_geoserver:8005" tls_cert= tls_key=
msg="backend/gateway: connected to mqtt server"
msg="gateway/mqtt: subscribing to gateway event topic" qos=0 topic=gateway/+/event/+
msg="configuring join-server client" ca_cert= server="http://lora_appserver:8003" tls_cert= tls_key=
msg="api: starting network-server api server" bind="0.0.0.0:8000" ca-cert= tls-cert= tls-key=
msg="starting downlink device-queue scheduler"
msg="starting multicast scheduler"

E.g. it subscribed for completely another topics.
Does it mean that I should update gatewaybridge software too?
What did I miss? How to update a software after more than year delay?)

Yes, the topics changed. You can either upgrade your gateway bridge deployments en masse, or run the translation tool while you update them at your leisure. Search the forum for previous threads on this topic.

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See for a summary: Upgrading from LoRa Server v2 to LoRa Server v3

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thank you very much!