host.json

{
    "version": "2.0",
    "watchDirectories": [ "Shared", "Test" ],
    "healthMonitor": {
        "enabled": true,
        "healthCheckInterval": "00:00:10",
        "healthCheckWindow": "00:02:00",
        "healthCheckThreshold": 6,
        "counterThreshold": 0.80
    },
    "functionTimeout": "00:05:00",
    "logging": {
        "fileLoggingMode": "always"        
    },
    "extensions": {
        "sendGrid": {
            "from": "Azure Functions <samples@functions.com>"
        },
        "http": {
            "routePrefix": "api",
            "maxConcurrentRequests": 5,
            "maxOutstandingRequests": 30
        },
        "queues": {
            "visibilityTimeout": "00:00:10",
            "maxDequeueCount": 3
        },
        "eventHubs": {
            "maxBatchSize": 1000,
            "prefetchCount": 1000,
            "batchCheckpointFrequency": 1
        },
        "serviceBus": {
            "prefetchCount": 100,
            "messageHandlerOptions": {
                "maxConcurrentCalls": 32
            }
        }
    }
}