Update postgres exporter, add podmonitor support

[bobertrublik]

Issue:

• Postgres exporter is out of date #62

Still work in progress.

[bobertrublik]

I renamed the test script file to a more generic name and the pipeline seems to have issues with it.
Here it tries to deploy the previous version 2.3.4 but for some reason it prints the new file name?

Error: UPGRADE FAILED: template: db-instances/templates/tests/test_monitoring.yaml:1:14: executing "db-instances/templates/tests/test_monitoring.yaml" at <.Values.tests.monitoring.enabled>: nil pointer evaluating interface {}.enabled

If I understand this correctly it tries to use the old values file for the updated chart? helm/chart-testing#525

[allanger]

If I understand this correctly it tries to use the old values file for the updated chart? helm/chart-testing#525

The upgrade test is sometimes weird, and I'm not sure which values it's using while upgrading, so it might be the case

[bobertrublik]

If I understand this correctly it tries to use the old values file for the updated chart? helm/chart-testing#525

The upgrade test is sometimes weird, and I'm not sure which values it's using while upgrading, so it might be the case

I think it simply uses the old values file for the new chart to test if people upgrading the chart without reading the changelog run into any issues.

[allanger]

Thanks!