[Metrics UI] The URL generated by the Metrics Explorer is not reusable

[hendry-lim]

Kibana version: 7.9.0-SNAPHSOT

Elasticsearch version: 7.9.0-SNAPSHOT

Browser version: Firefox 78.0.2

Original install method (e.g. download page, yum, from source, etc.): Docker

Describe the bug:
The URL generated by the Metrics Explorer is not reusable.

Use case: I would like to include a link to the Metrics Explorer in the alert message to automatically select the metrics, grouping, filter, and time range filter.

Steps to reproduce:

1. In Kibana, go to Metrics --> Metrics Explorer
2. Choose to plot Average of system.memory.actual.used.pct (any metric)
3. Graph per: host.name
4. Filter: host.name:"hostname" (any host name)
5. Set the start time filter to a specific time in the past
6. Copy and paste the URL to another browser tab, observe that all fields reverted to default

Expected behavior:
All selected metrics, filters, grouping, and time filter should be the same as those selected in the steps above.

Any additional context:
Sample URL:
http://localhost:5601/app/metrics/explorer?metricsExplorer=(chartOptions:(stack:!f,type:line,yAxisMode:fromZero),options:(aggregation:avg,filterQuery:%27host.name:%22alpine07%22%27,groupBy:!(host.name),metrics:!((aggregation:avg,color:color0,field:system.memory.actual.used.pct)),source:default),timerange:(from:%272020-07-23T23:00:00.000Z%27,interval:%3E%3D10s,to:now))&waffleFilter=(expression:%27%27,kind:kuery)&waffleOptions=(accountId:%27%27,autoBounds:!t,boundsOverride:(max:1,min:0),customMetrics:!(),customOptions:!(),groupBy:!(),legend:(palette:cool,reverseColors:!f,steps:10),metric:(type:cpu),nodeType:host,region:%27%27,sort:(by:name,direction:desc),source:default,view:map)&waffleTime=(currentTime:1595550410191,isAutoReloading:!f)

[elasticmachine]

Pinging @elastic/logs-metrics-ui (Team:logs-metrics-ui)

[hendry-lim]

This works fine in 7.8.1, but not in 7.9.0-SNAPSHOT.

Comparing the URL generated in 7.8.1

/app/metrics/explorer?metricsExplorer=(chartOptions:(stack:!f,type:line,yAxisMode:fromZero),options:(aggregation:avg,filterQuery:%27%27,groupBy:host.name,metrics:!((aggregation:avg,color:color0,field:system.cpu.total.norm.pct))),timerange:(from:now-1h,interval:%3E%3D10s,to:now))

and 7.9.0-SNAPSHOT

/app/metrics/explorer?metricsExplorer=(chartOptions:(stack:!f,type:line,yAxisMode:fromZero),options:(aggregation:avg,filterQuery:%27%27,groupBy:!(host.name),metrics:!((aggregation:avg,color:color0,field:system.memory.actual.used.pct)),source:default),timerange:(from:%272020-07-23T23:00:00.000Z%27,interval:%3E%3D10s,to:now))

noticed 2 differences:

1. 7.8.1 --> groupBy:host.name and 7.9.0-SNAPSHOT --> groupBy:!(host.name)
2. 7.8.1 --> no source param and 7.9.0-SNAPSHOT --> source:default

The metric, filters, and grouping are preserved, if the URL in 7.9.0-SNAPSHOT is changed based on the following:

• groupBy:!(host.name) --> groupBy:host.name
• source:default --> source:url

/app/metrics/explorer?metricsExplorer=(chartOptions:(stack:!f,type:line,yAxisMode:fromZero),options:(aggregation:avg,filterQuery:%27%27,groupBy:host.name,metrics:!((aggregation:avg,color:color0,field:system.cpu.total.norm.pct)),source:url),timerange:(from:now-1h,interval:%3E%3D10s,to:now))

[simianhacker]

Thanks @hendry-lim for filing this.