eds: clarify total_error_requests as HTTP 5xx. (#181)
eds: clarify total_error_requests as HTTP 5xx. (#181)

Signed-off-by: d60e899f0485f6a7a9ffd5fc5f11d6a7eb18b470@google.com
jrajahalme/envoy-api,lyft/envoy-api,lyft/envoy-api,jrajahalme/envoy-api,rshriram/envoy-api,rshriram/envoy-api,jrajahalme/envoy-api,jrajahalme/envoy-api,lyft/envoy-api,rshriram/envoy-api