Odd number of arguments passed as key-value pairs for logging

[zroubalik]

Report

If deprecated metricName is specified in the trigger config, the proper Deprecation message is not printed because it contains an odd number of arguments passed as key-value pairs for logging.

See this Slack thread for details: https://kubernetes.slack.com/archives/CKZJ36A5D/p1678795830230389

Workaround

Remove deprecated metricName from the trigger config.

Expected Behavior

print proper deprecation message

Actual Behavior

error

Steps to Reproduce the Problem

1. deploy SO with metricName

Logs from KEDA operator

2023-03-14T12:02:29Z    DPANIC  odd number of arguments passed as key-value pairs for logging   {"ignored key": "prometheus"}
github.com/kedacore/keda/v2/controllers/keda.(*ScaledObjectReconciler).checkTriggers
        /workspace/controllers/keda/scaledobject_controller.go:358
github.com/kedacore/keda/v2/controllers/keda.(*ScaledObjectReconciler).reconcileScaledObject
        /workspace/controllers/keda/scaledobject_controller.go:223
github.com/kedacore/keda/v2/controllers/keda.(*ScaledObjectReconciler).Reconcile
        /workspace/controllers/keda/scaledobject_controller.go:175
sigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).Reconcile
        /workspace/vendor/sigs.k8s.io/controller-runtime/pkg/internal/controller/controller.go:122
sigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).reconcileHandler
        /workspace/vendor/sigs.k8s.io/controller-runtime/pkg/internal/controller/controller.go:323
sigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).processNextWorkItem
        /workspace/vendor/sigs.k8s.io/controller-runtime/pkg/internal/controller/controller.go:274
sigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).Start.func2.2
        /workspace/vendor/sigs.k8s.io/controller-runtime/pkg/internal/controller/controller.go:235

KEDA Version

2.10.0

Relates: #4220