[inspector] clusters tab MVP

[nreese]

Closes #166021
Closes #163381

This PR adds inspector cluster tab MVP

This PR does not:

1. include all UI elements in design. These will be added at later dates.
2. show clusters tab when request fails. Somewhere between kibana server elasticsearch request and the client, the raw response is getting removed for failed requests. This will have to be sorted out in a separate PR.
3. Opening clusters tab from "incomplete data" warnings

Test setup

1. Start remote elasticsearch by running: yarn es snapshot -E transport.port=9500 -E http.port=9201 -E path.data=../remote1
2. Install sample data to remote cluster
   1. Add elasticsearch.hosts: ["http://localhost:9201"] to kibana.dev.yml. Note create config/kibana.dev.yml if one does not exist. kibana.dev.yml is not managed by git so it has to be created the first time you add values.
   2. run yarn start to start kibana process
   3. install sample web logs data set on home page
   4. install sample flight data set on home page
   5. stop kibana process
   6. remove elasticsearch.hosts from kibana.dev.yml
3. Start local elasticsearch by running: yarn es snapshot -E path.data=../local1
4. Start kibana
5. Add remote cluster under "Stack management -> Remote clusters"
   1. Set Name to "remote1"
   2. Set Seed nodes to "localhost:9500"
   3. Enable Skip if unavailable
6. install sample web logs data set
7. install sample flights data set
8. Create data view.
   1. Set Index pattern to kibana_sample_data*,remote1:kibana_sample_data*
   2. Set Time field to timestamp

Local cluster (status=successful)

1. Open discover
2. Select "Kibana sample data logs" data view
3. Open inspector
4. Open clusters tab
   

Remote cluster (status=successful)

1. Open discover
2. Select "kibana_sample_data*,remote1:kibana_sample_data*" data view
3. Open inspector
4. Open clusters tab
   

Remote cluster (status=partial, failed shard)

1. Open discover
2. Select "kibana_sample_data*,remote1:kibana_sample_data*" data view
3. Add filter

   {
     "error_query": {
       "indices": [
         {
           "error_type": "exception",
           "message": "local shard failure message 123",
           "name": "remote1:kibana_sample_data_logs",
           "shard_ids": [
             0
           ]
         }
       ]
     }
   }
   

4. Open inspector
5. Open clusters tab
   
   

Remote cluster (status=skipped, all shards fail)

1. Open discover
2. Select "kibana_sample_data*,remote1:kibana_sample_data*" data view
3. Add filter

   {
     "error_query": {
       "indices": [
         {
           "error_type": "exception",
           "message": "local shard failure message 123",
           "name": "remote1:*",
           "shard_ids": [
             0
           ]
         }
       ]
     }
   }
   

4. Open inspector
5. Open clusters tab
   

Remote cluster (status=skipped, no remote)

1. Open discover
2. Kill process running remote1 elasticsearch
3. Select "kibana_sample_data*,remote1:kibana_sample_data*" data view
4. Open inspector
5. Open clusters tab
   

[elasticmachine]

Pinging @elastic/kibana-presentation (Team:Presentation)

[nreese]

@elasticmachine merge upstream

[nreese]

@elasticmachine merge upstream

[nreese]

@elasticmachine merge upstream

[ThomThomson]

Looked through the code, and followed the instructions for testing in Discover. I also did some testing in Dashboard and everything looks great.

Nice test coverage, and very clean code. Left a few very small nits. The only thing that could elevate this is some functional test coverge, but I assume we'll be adding CCS functional test coverage in the future.

[kibana-ci]

💚 Build Succeeded

• Buildkite Build
• Commit: f47a321

Metrics [docs]

Module Count

Fewer modules leads to a faster build time

id	before	after	diff
inspector	41	57	+16

Async chunks

Total size of all lazy-loaded chunks that will be downloaded as the user navigates the app

id	before	after	diff
inspector	16.2KB	26.4KB	+10.3KB

Page load bundle

Size of the bundles that are downloaded on every page load. Target size is below 100kb

id	before	after	diff
inspector	22.1KB	22.2KB	+104.0B

History

• 💔 Build #162685 failed 57400e1
• 💚 Build #162010 succeeded ef30299
• 💔 Build #161714 failed ec6805c
• 💔 Build #161323 failed 830ed94
• 💔 Build #161251 failed a18922f

To update your PR or re-run it, just comment with:
@elasticmachine merge upstream