A mangrove-creek site is instrumented and looks green in Application Insights while the public homepage is unreachable from Europe. What complementary check should the developer add?
Select an answer to reveal the explanation.
Short Explanation
SDK telemetry is inside-out—it only sees work that already hit the app. Availability tests are outside-in probes. Use both; do not swap in Redis.
Full Explanation
In-process Application Insights instrumentation reports requests and dependencies that reach the running app. If clients cannot reach the site, those charts can still look healthy. A Standard availability test provides complementary outside-in coverage. Redis is not a substitute, and disabling the SDK removes useful inside-out data.