[Synthetics UI] Add the ability to specify more spaces for a monitor

[Erikg346]

Describe the issue;

Add the ability to specify more than one space to create Synthetic Monitors.

Describe a specific use case for the feature:
Currently, Synthetic Monitors are specifically designed for individual spaces. Monitors are only present in the space they were created in or added to.
This raises the issue of possibly creating duplicate monitors and low visibility in the management of Synthetic monitors.

I will also add that Heartbeat-Uptime did not have this issue but it's being deprecated soon 👎

[vigneshshanmugam]

Trying to understand the use-case a bit more.

Is the intention here to share the monitors across two spaces meaning no duplicates, just the ability to see monitors on other space? If its to duplicate monitors across two spaces, you can workaround by running push command two times

npx @elastic/synthetics push --space foo

npx @elastic/synthetics push --space bar

[Erikg346]

Hey @vigneshshanmugam
share monitors across more spaces than just 1 (kinda like how uptime did).
I don't see the value of creating duplicate monitors in each space.

[vigneshshanmugam]

@shahzad31 @dominiqueclarke @justinkambic Could one of you please chime in here and see if this is something possible with our current Synthetics Kibana application.

[shahzad31]

@Erikg346

I will also add that Heartbeat-Uptime did not have this issue but it's being deprecated soon 👎

we have changed our plans regarding uptime, it will remain as is, until we can cover all feature gaps with synthetics.