feat(query): update query processing to support new grafana dashboard

[tthvo]

Fixes #128
Fixes #129
Fixes #130
Fixes #134
Fixes #78
Fixes #62
Related to cryostatio/cryostat-grafana-dashboard#12

What's new?

• Queries now support url-parameter-styled target (Only timeseries). This is primarily used to categorize plots based on a field of the same event. For example:

  {
    "target": " jdk.ObjectAllocationSample.weight?objectClass=java.lang.String,java.util.ArrayList",
    "refId":"A",
    "type":"timeserie"
  }

  Use case: individual plots on jdk.ObjectAllocationSample.weight for each class type using variables & single panel with all plots identified by legends.

• /search endpoint was corrected to accept POST with search target in request body. SimpleJson plugin was not clear about this, but another similar alternative explains well: https://grafana.com/grafana/plugins/simpod-json-datasource/. For example:

  $ curl -X POST --data '{ "target": "jdk.ObjectAllocationSample.classObject" }' localhost:8080/search

  Use case: used to defined a variable that can be reference in queries. See posts on grafana variables: https://grafana.com/docs/grafana/latest/dashboards/variables/

• A well-known unit is defined for returned data:

  • memory: BYTE
  • timespan: MILISECOND
  • frequency: Hz
  • Others (e.g. counts, epochMs): no change

• Non-numeric fields are also returned as data points if specified. Some fields are not string (i.e. JSON) so it is on the "query-er" to do transformation/override.

• Recording metadata (i.e. recordingDuration and startTime) does not depends on jdk.ActiveRecording event. See Andrew's comment. This helps panel of these information persist across time frame changes and avoid overlapping of other recordings.

• Test resources (i.e. test recording) are updated to support new event jdk.ObjectAllocationSample.

See corresponding Grafana updates: cryostatio/cryostat-grafana-dashboard#12

[maxcao13]

I'm wondering if it's possible to set the time range automatically when "setting" the file?

[tthvo]

I'm wondering if it's possible to set the time range automatically when "setting" the file?

Related to cryostatio/cryostat-grafana-dashboard#13. Unfortunately, I am not sure they implemented the feature yet :\

[tthvo]

No support for /annotations route yet but its route should serve POST for compatibility with plugin.