public static void Set(this Prometheus.Counter counter, double value)
{
if (counter.Value < value)
{
counter.Inc(value - counter.Value);
}
}
public async Task Invoke(HttpContext httpContext)
{
string path = httpContext.Request.Path.Value;
string method = httpContext.Request.Method;
Prometheus.Counter counter = Prometheus.Metrics.CreateCounter(
"prometheus_request_total",
"HTTP Requests Total",
new Prometheus.CounterConfiguration {
LabelNames = new[] { "path", "method", "status" }
}
);
try
{
await next.Invoke(httpContext);
}
catch (Exception)
{
int statusCode = 500;
counter.Labels(path, method, statusCode.ToString()).Inc();
throw;
}
if (path != "/metrics")
{
counter.Labels(path, method, httpContext.Response.StatusCode.ToString()).Inc();
}
}
public Prometheus.Counter CreateCounter(string name, string help, params string[] labelNames)
{
var metric = new Prometheus.Counter(name, help, labelNames);
return((Prometheus.Counter)_registry.GetOrAdd(metric));
}
public Prometheus.Counter CreateCounter(string name, string help, params string[] labelNames)
{
var metric = new Prometheus.Counter(name, help, labelNames);
_registry.Register(metric);
return metric;
}
public Prometheus.Counter CreateCounter(string name, string help, params string[] labelNames)
{
var metric = new Prometheus.Counter(name, help, labelNames);
return (Prometheus.Counter) _registry.GetOrAdd(metric);
}
