promql expr validation issues

[LinTechSo]

Hi.
promql expr validator in code caused issues because of lack of compatibility with some new promql inspired query engines like MetricsQL.
I think it would be helpful if we add some feature to sloth to allow people to disable promql validation if they want

For example:

i want to create a SLO from this SLI

version: "prometheus/v1"
service: "myservice"
slos:
## Latency
  - name: "my_metricsql-query"
    objective: 99.5
    description: ""
    sli:
      events:
        error_query: sum(count_over_time((my-metrics{} > 15)) OR on() vector(0) )
        total_query: sum(count_over_time((my-metric{})) OR on() vector(0))
    alerting:
      page_alert:
        disable: true
      ticket_alert:
        disable: true 

but i got error

INFO[0000] SLI plugins loaded                            plugins=0 svc=storage.FileSLIPlugin version=v0.11.0 window=30d
INFO[0000] SLO period windows loaded                     svc=alert.WindowsRepo version=v0.11.0 window=30d windows=2
INFO[0000] Generating from Prometheus spec               version=v0.11.0 window=30d
error: "generate" command failed: could not generate Prometheus format rules: could not generate prometheus rules: invalid SLO group: Key: 'SLOGroup.SLOs[0].SLI.Events.ErrorQuery' Error:Field validation for 'ErrorQuery' failed on the 'prom_expr' tag
Key: 'SLOGroup.SLOs[0].SLI.Events.TotalQuery' Error:Field validation for 'TotalQuery' failed on the 'prom_expr' tag

My query is actually correct and give me response from VictoriaMetrics in grafana with VictoriaMetrics prometheus data source

My suggestion is adding a capability of disabling promexpr validation with some flag
for example:

sloth generate -i ../my-victoriametrics-queries/test.yml -o /tmp/test.yaml --disable-promExpr-validation

[LinTechSo]

I created a pull request for fix this issue
#511

i would appreciate if you check it

[LinTechSo]

According to below PRs this issues has fixed
#512
and
r3code#4