Collect backendTLSPolicy and GRPCRoute Count

[salonichf5]

Proposed changes

Problem: As a maintainer of NGF
I want to collect the GRPCRoute and BackendTLSPolicy count from all NGF/NIC installations
So that I can understand many GRPCRoute and BackendTLSPolicy are being configured using NGF.

Solution: Adding two new fields GRPCRouteCount, BackendTLSPolicyCount to telemetry data collector.

Testing: Manual Testing

No GRPCRoute and BackendPolicy is configured

{"level":"debug","ts":"2024-05-09T23:46:14Z","logger":"telemetryExporter","msg":"Exporting telemetry","data":{"ImageSource":"local","ProjectName":"NGF","ProjectVersion":"edge","ProjectArchitecture":"arm64","ClusterID":"a7992d83-18d6-4e71-a9b7-bc5327f18ba2","ClusterVersion":"1.29.2","ClusterPlatform":"kind","InstallationID":"c19e4ddd-d5dc-4a56-bb4a-68b32a8ae4c4","ClusterNodeCount":1,"FlagNames":["config","gateway","gateway-api-experimental-features","gateway-ctlr-name","gatewayclass","health-disable","health-port","help","leader-election-disable","leader-election-lock-name","metrics-disable","metrics-port","metrics-secure-serving","nginx-plus","product-telemetry-disable","service","update-gatewayclass-status","usage-report-cluster-name","usage-report-secret","usage-report-server-url","usage-report-skip-verify"],"FlagValues":["user-defined","default","true","user-defined","user-defined","false","default","false","false","user-defined","false","default","false","false","false","user-defined","true","default","default","default","false"],"GatewayCount":1,"GatewayClassCount":1,"HTTPRouteCount":1,"SecretCount":0,"ServiceCount":1,"EndpointCount":1,"GRPCRouteCount":0,"BackendTLSPolicyCount":1,"NGFReplicaCount":1}}

With 4 GRPCRoute configured following example

{"level":"debug","ts":"2024-05-09T23:57:38Z","logger":"telemetryExporter","msg":"Exporting telemetry","data":{"ImageSource":"local","ProjectName":"NGF","ProjectVersion":"edge","ProjectArchitecture":"arm64","ClusterID":"a7992d83-18d6-4e71-a9b7-bc5327f18ba2","ClusterVersion":"1.29.2","ClusterPlatform":"kind","InstallationID":"c19e4ddd-d5dc-4a56-bb4a-68b32a8ae4c4","ClusterNodeCount":1,"FlagNames":["config","gateway","gateway-api-experimental-features","gateway-ctlr-name","gatewayclass","health-disable","health-port","help","leader-election-disable","leader-election-lock-name","metrics-disable","metrics-port","metrics-secure-serving","nginx-plus","product-telemetry-disable","service","update-gatewayclass-status","usage-report-cluster-name","usage-report-secret","usage-report-server-url","usage-report-skip-verify"],"FlagValues":["user-defined","default","true","user-defined","user-defined","false","default","false","false","user-defined","false","default","false","false","false","user-defined","true","default","default","default","false"],"GatewayCount":3,"GatewayClassCount":1,"HTTPRouteCount":1,"SecretCount":0,"ServiceCount":1,"EndpointCount":1,"GRPCRouteCount":4,"BackendTLSPolicyCount":1,"NGFReplicaCount":1}}

With GRPCRoute and BackendTLSPolicy configured

{"level":"debug","ts":"2024-05-10T00:01:19Z","logger":"telemetryExporter","msg":"Exporting telemetry","data":{"ImageSource":"local","ProjectName":"NGF","ProjectVersion":"edge","ProjectArchitecture":"arm64","ClusterID":"a7992d83-18d6-4e71-a9b7-bc5327f18ba2","ClusterVersion":"1.29.2","ClusterPlatform":"kind","InstallationID":"c19e4ddd-d5dc-4a56-bb4a-68b32a8ae4c4","ClusterNodeCount":1,"FlagNames":["config","gateway","gateway-api-experimental-features","gateway-ctlr-name","gatewayclass","health-disable","health-port","help","leader-election-disable","leader-election-lock-name","metrics-disable","metrics-port","metrics-secure-serving","nginx-plus","product-telemetry-disable","service","update-gatewayclass-status","usage-report-cluster-name","usage-report-secret","usage-report-server-url","usage-report-skip-verify"],"FlagValues":["user-defined","default","true","user-defined","user-defined","false","default","false","false","user-defined","false","default","false","false","false","user-defined","true","default","default","default","false"],"GatewayCount":3,"GatewayClassCount":1,"HTTPRouteCount":1,"SecretCount":0,"ServiceCount":1,"EndpointCount":1,"GRPCRouteCount":4,"BackendTLSPolicyCount":1,"NGFReplicaCount":1}}

Closes #1615
Closes #1839

Checklist

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• I have read the CONTRIBUTING doc
• I have added tests that prove my fix is effective or that my feature works
• I have checked that all unit tests pass after adding my changes
• I have updated necessary documentation
• I have rebased my branch onto main
• I will ensure my PR is targeting the main branch and pulling from my branch from my own fork

Release notes

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please add a brief note that summarizes the change.

Collects BackendTLSPolicy and GRPCRoute counts configured with NGINX Gateway Fabric

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.04%. Comparing base (59c8f50) to head (940b00a).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1954      +/-   ##
==========================================
+ Coverage   87.03%   87.04%   +0.01%     
==========================================
  Files          89       89              
  Lines        6091     6096       +5     
  Branches       50       50              
==========================================
+ Hits         5301     5306       +5     
  Misses        737      737              
  Partials       53       53              

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[kate-osborn]

LGTM