Add longevity test results

Author: bjee19

tests/results/longevity/1.6.0/oss-cpu.png

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+# Results
+
+## Test environment
+
+NGINX Plus: false
+
+NGINX Gateway Fabric:
+
+- Commit: 8be03e1fc5161a2b1bc0962fb0d8732114a9093d
+- Date: 2025-01-14T18:57:38Z
+- Dirty: true
+
+GKE Cluster:
+
+- Node count: 3
+- k8s version: v1.30.6-gke.1596000
+- vCPUs per node: 2
+- RAM per node: 4018128Ki
+- Max pods per node: 110
+- Zone: us-central1-c
+- Instance Type: e2-medium
+
+## Traffic
+
+HTTP:
+
+```text
+Running 5760m test @ http://cafe.example.com/coffee
+  2 threads and 100 connections
+  Thread Stats   Avg      Stdev     Max   +/- Stdev
+    Latency   189.49ms  147.10ms   2.00s    78.44%
+    Req/Sec   293.54    193.84     1.95k    66.59%
+  198532845 requests in 5760.00m, 67.91GB read
+  Socket errors: connect 0, read 309899, write 63, timeout 2396
+Requests/sec:    574.46
+Transfer/sec:    206.05KB
+```
+
+HTTPS:
+
+```text
+Running 5760m test @ https://cafe.example.com/tea
+  2 threads and 100 connections
+  Thread Stats   Avg      Stdev     Max   +/- Stdev
+    Latency   179.59ms  121.50ms   1.99s    67.56%
+    Req/Sec   292.54    193.88     2.39k    66.47%
+  197890521 requests in 5760.00m, 66.57GB read
+  Socket errors: connect 176, read 303560, write 0, timeout 7
+Requests/sec:    572.60
+Transfer/sec:    201.98KB
+```
+
+### Logs
+
+No error logs in nginx-gateway.
+
+No error logs in nginx.
+
+
+### Key Metrics
+
+#### Containers memory
+
+![oss-memory.png](oss-memory.png)
+
+#### NGF Container Memory
+
+![oss-ngf-memory.png](oss-ngf-memory.png)
+
+### Containers CPU
+
+![oss-cpu.png](oss-cpu.png)
+
+### NGINX metrics
+
+![oss-stub-status.png](oss-stub-status.png)
+
+### Reloads
+
+Rate of reloads - successful and errors:
+
+![oss-reloads.png](oss-reloads.png)
+
+Reload spikes correspond to 1 hour periods of backend re-rollouts.
+
+No reloads finished with an error.
+
+Reload time distribution - counts:
+
+![oss-reload-time.png](oss-reload-time.png)
+
+
+## Comparison with previous results
+
+Graphs look similar to 1.5.0 results. There is a color change swap in a few graphs which is a little confusing.
+NGINX container memory increased dramatically. NGINX Stub Status graph is confusing to interpret, which can make it seem
+quite different to the 1.5.0 results, but it is similar, only with an increase in requests.