fix: Google dns provider metrics name key

The google providers instrumented client has the name "google" and not "gcp", so no google provider metrics are currently appearing on the grafana dashboard https://github.com/Kuadrant/dns-operator/blob/main/internal/provider/google/google.go#L131

Signed-off-by: Michael Nairn <[email protected]>

examples/dashboards/dns-operator.json

@@ -469,7 +469,7 @@
             "uid": "${datasource}"
           },
           "editorMode": "code",
-          "expr": "histogram_quantile(0.99, sum by(le, client) (rate(http_client_request_latency_seconds_bucket{client=~\"aws|gcp|azure\",code=\"200\"}[15m])))",
+          "expr": "histogram_quantile(0.99, sum by(le, client) (rate(http_client_request_latency_seconds_bucket{client=~\"aws|google|azure\",code=\"200\"}[15m])))",
           "legendFormat": "{{client}}:99%ile",
           "range": true,
           "refId": "A"
@@ -480,7 +480,7 @@
             "uid": "${datasource}"
           },
           "editorMode": "code",
-          "expr": "histogram_quantile(0.95, sum by(le, client) (rate(http_client_request_latency_seconds_bucket{client=~\"aws|gcp|azure\",code=\"200\"}[15m])))",
+          "expr": "histogram_quantile(0.95, sum by(le, client) (rate(http_client_request_latency_seconds_bucket{client=~\"aws|google|azure\",code=\"200\"}[15m])))",
           "hide": false,
           "legendFormat": "{{client}}:95%ile",
           "range": true,
@@ -571,7 +571,7 @@
             "uid": "${datasource}"
           },
           "editorMode": "code",
-          "expr": "sum by (client, code) (rate(http_client_requests_total{client=~\"aws|gcp|azure\"}[15m]))",
+          "expr": "sum by (client, code) (rate(http_client_requests_total{client=~\"aws|google|azure\"}[15m]))",
           "hide": false,
           "legendFormat": "{{client}}:{{code}}",
           "range": true,