master-pgsql attribute disappear

[dumm1]

Today I checked my cluster and it showed a different status of my cluster. The db-node-1 lost "master-pgsql" attribute.

Node Attributes:
* Node db-node-1:
    + pgsql-data-status                 : STREAMING|SYNC
    + pgsql-status                      : HS:sync   
* Node db-node-2:
    + master-pgsql                      : 1000      
    + pgsql-data-status                 : LATEST    
    + pgsql-master-baseline             : 0001058A12000098
    + pgsql-status                      : PRI  

Previously, it was like below.

Node Attributes:
* Node db-node-1:
    + master-pgsql                      : 100       
    + pgsql-data-status                 : STREAMING|SYNC
    + pgsql-status                      : HS:sync   
* Node db-node-2:
    + master-pgsql                      : 1000      
    + pgsql-data-status                 : LATEST    
    + pgsql-master-baseline             : 0001058A12000098
    + pgsql-status                      : PRI 

I made no changes. What happened to the lost attribute? Is there any impact as the attribute is not displayed? If possible, I want to find some hints from the log? Bring it back would be better.

[oalbrigt]

I dont see what would cause this (from the agent's code).

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