Powerdns-recursor answers graphs not showing

Hi,

we’re running into issues with the powerdns-recursor app.

===========================================
Component | Version
--------- | -------
LibreNMS | 23.1.0-26-g4b2fb79c1 (2023-02-14T13:51:16+00:00)
DB Schema | 2022_08_15_084507_add_rrd_type_to_wireless_sensors_table (248)
PHP | 8.1.13
Python | 3.8.10
Database | MariaDB 10.3.37-MariaDB-0ubuntu0.20.04.1
RRDTool | 1.7.2
SNMP | 5.8
===========================================

[OK] Composer Version: 2.5.2
[OK] Dependencies up-to-date.
[OK] Database connection successful
[OK] Database Schema is current
[OK] SQL Server meets minimum requirements
[OK] lower_case_table_names is enabled
[OK] MySQL engine is optimal
[OK] Database and column collations are correct
[OK] Database schema correct
[OK] MySQl and PHP time match
[OK] Active pollers found
[OK] Dispatcher Service not detected
[OK] Locks are functional
[OK] Python poller wrapper is polling
[OK] Redis is unavailable
[OK] rrd_dir is writable
[OK] rrdtool version ok

On this version it is properly collecting values from powerdns-recursor for answers:

SQL[UPDATE application_metrics set value=?,value_prev=? WHERE app_id=? && metric=? [1410,1398,5,“answers-slow”] 13.57ms]
SQL[UPDATE application_metrics set value=?,value_prev=? WHERE app_id=? && metric=? [20536,20417,5,“answers0-1”] 13.56ms]

When opening /tab=apps/app=powerdns-recursor/ the follwoing error is presented:

[2023-02-16T08:01:19.563088+00:00] production.ERROR: implode(): Argument #2 ($array) must be of type ?array, string given {“userId”:1,“exception”:“[object] (TypeError(code: 0): implode(): Argument #2 ($array) must be of type ?array, string given at /opt/librenms/includes/html/graphs/generic_multi.inc.php:96)”}

Any ideas how to solve this issue?

Hi there! I’m facing the same issue, was a solution found for this?

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