[RHCLOUD-37402] Replace Grafana lag metrics with AWS MSK and use timeseries pansel

[jessicarod7]

What?

https://issues.redhat.com/browse/RHCLOUD-37402

1. Replace outdated metrics in Grafana panels with new metrics pulled from AWS MSK
2. Replace deprecated Grafana graph (AngularJS) panels with timeseries

Why?

• The datasource for the existing Kafka metrics is being deprecated, so it must be replaced
• Plots using the AngularJS "graph" are being deprecated

How?

1. Update "Consumer lag" panel from kafka_consumergroup_group_lag to aws_kafka_sum_offset_lag_sum metric
2. Switch "Request rate", "Errors", and "Connector errors" panels from deprecated "Graph" type to "Time series"
   • Update "RDS storage usage panel to use current AppSRE cluster as datasource, and use "Time series" type

Testing

Visualized while making edits in Grafana.

Secure Coding Practices Checklist Link

• https://github.com/RedHatInsights/secure-coding-checklist

Secure Coding Checklist

• Input Validation
• Output Encoding
• Authentication and Password Management
• Session Management
• Access Control
• Cryptographic Practices
• Error Handling and Logging
• Data Protection
• Communication Security
• System Configuration
• Database Security
• File Management
• Memory Management
• General Coding Practices

[jessicarod7]

not included in this PR would be switching the "Request rate" panel over to the metric api_3scale_gateway_api_status, but I'm not sure if that's appropriate for this service