Recovered from panic while fetching 'azure/app_insights' for host ''. [AZURE]

[miki_haiat]

Hey,

I'm trying to send app_insights metric via metric beat to elastic.
I can't see any reference to 'host' in the app_insight docs

Any suggestion on how to solve this panic error

I found the cause of the error, where the host is set in the configuration file ?

2021-02-03T16:08:07.607+0200    DEBUG   [module]        module/wrapper.go:189   Starting metricSetWrapper[module=azure, name=app_insights, **host=]**

This is my configuration

  >   metricbeat.modules:
> - module: azure
>   metricsets:
>     - app_insights
>   enabled: true
>   period: 10s
>   application_id: '******'
>   api_key: '****'
>   metrics:
>     - id: ["requests/count", "requests/duration","performanceCounters/processorCpuPercentag"]
>       segment: "request/name"
>       aggregation: ["sum"]

stack trace

> ERROR   runtime/panic.go:212    recovered from panic while fetching 'azure/app_insights' for host ''. Recovering, but please report this.    {"panic": "runtime error: invalid memory address or nil pointer dereference", "stack": "github.com/elastic/beats/v7/libbeat/logp.Recover\n\t/go/src/github.com/elastic/beats/libbeat/logp/global.go:101\nruntime.gopanic\n\t/usr/local/go/src/runtime/panic.go:969\nruntime.panicmem\n\t/usr/local/go/src/runtime/panic.go:212\nruntime.sigpanic\n\t/usr/local/go/src/runtime/signal_windows.go:246\ngithub.com/elastic/beats/v7/x-pack/metricbeat/module/azure/app_insights.mapMetricValues\n\t/go/src/github.com/elastic/beats/x-pack/metricbeat/module/azure/app_insights/data.go:53\ngithub.com/elastic/beats/v7/x-pack/metricbeat/module/azure/app_insights.EventsMapping\n\t/go/src/github.com/elastic/beats/x-pack/metricbeat/module/azure/app_insights/data.go:125\ngithub.com/elastic/beats/v7/x-pack/metricbeat/module/azure/app_insights.(*MetricSet).Fetch\n\t/go/src/github.com/elastic/beats/x-pack/metricbeat/module/azure/app_insights/app_insights.go:74\ngithub.com/elastic/beats/v7/metricbeat/mb/module.(*metricSetWrapper).fetch\n\t/go/src/github.com/elastic/beats/metricbeat/mb/module/wrapper.go:256\ngithub.com/elastic/beats/v7/metricbeat/mb/module.(*metricSetWrapper).startPeriodicFetching\n\t/go/src/github.com/elastic/beats/metricbeat/mb/module/wrapper.go:224\ngithub.com/elastic/beats/v7/metricbeat/mb/module.(*metricSetWrapper).run\n\t/go/src/github.com/elastic/beats/metricbeat/mb/module/wrapper.go:208\ngithub.com/elastic/beats/v7/metricbeat/mb/module.(*Wrapper).Start.func1\n\t/go/src/github.com/elastic/beats/metricbeat/mb/module/wrapper.go:147"}