/// <summary>
/// Adds a durable sink that will send log events to Grafana Loki. A durable sink
/// will persist log events on disk in buffer files before sending them over the
/// network, thus protecting against data loss after a system or process restart. The
/// buffer files will use a rolling behavior defined by the file size specified in
/// <paramref name="bufferFileSizeLimitBytes"/>, i.e. a new buffer file is created when
/// current has passed its limit. The maximum number of retained files is defined by
/// <paramref name="retainedBufferFileCountLimit"/>, and when that limit is reached the
/// oldest file is dropped to make room for a new.
/// </summary>
/// <param name="sinkConfiguration">
/// The logger configuration.
/// </param>
/// <param name="uri">
/// The root URI of Loki.
/// </param>
/// <param name="bufferBaseFileName">
/// The relative or absolute path for a set of files that will be used to buffer events
/// until they can be successfully transmitted across the network. Individual files will be
/// created using the pattern "<paramref name="bufferBaseFileName"/>*.json", which should
/// not clash with any other file names in the same directory. Default value is "Buffer".
/// </param>
/// <param name="bufferFileSizeLimitBytes">
/// The approximate maximum size, in bytes, to which a buffer file for a specific time interval will be
/// allowed to grow. By default no limit will be applied.
/// </param>
/// <param name="bufferFileShared">
/// Allow the buffer file to be shared by multiple processes. Default value is false.
/// </param>
/// <param name="retainedBufferFileCountLimit">
/// The maximum number of buffer files that will be retained, including the current buffer
/// file. Under normal operation only 2 files will be kept, however if the log server is
/// unreachable, the number of files specified by <paramref name="retainedBufferFileCountLimit"/>
/// will be kept on the file system. For unlimited retention, pass null. Default value is 31.
/// </param>
/// <param name="labels">
/// The globals log event labels, which will be user for enriching all requests.
/// </param>
/// <param name="excludedLabels">
/// Keys, which would be excluded from a the label list in a payload.
/// </param>
/// <param name="credentials">
/// Auth <see cref="LokiCredentials"/>.
/// </param>
/// <param name="outputTemplate">
/// A message template describing the format used to write to the sink.
/// Default value is <code>"[{Timestamp:HH:mm:ss} {Level:u3}] {Message:lj}{NewLine}{Exception}"</code>.
/// </param>
/// <param name="restrictedToMinimumLevel">
/// The minimum level for events passed through the sink.
/// Default value is <see cref="LevelAlias.Minimum"/>.
/// </param>
/// <param name="batchPostingLimit">
/// The maximum number of events to post in a single batch. Default value is 1000.
/// </param>
/// <param name="queueLimit">
/// The maximum number of events stored in the queue in memory, waiting to be posted over
/// the network. Default value is infinitely.
/// </param>
/// <param name="period">
/// The time to wait between checking for event batches. Default value is 2 seconds.
/// </param>
/// <param name="textFormatter">
/// The formatter rendering individual log events into text, for example JSON. Default
/// value is <see cref="MessageTemplateTextFormatter"/>.
/// </param>
/// <param name="httpClient">
/// A custom <see cref="IHttpClient"/> implementation. Default value is
/// <see cref="DefaultLokiHttpClient"/>.
/// </param>
/// <returns>Logger configuration, allowing configuration to continue.</returns>
public static LoggerConfiguration DurableGrafanaLokiUsingFileSizeRolledBuffers(
this LoggerSinkConfiguration sinkConfiguration,
string uri,
string bufferBaseFileName = "Buffer",
long?bufferFileSizeLimitBytes = 1024 * 1024 * 1024,
bool bufferFileShared = false,
int?retainedBufferFileCountLimit = 31,
IEnumerable <LokiLabel> labels = null,
IEnumerable <string> excludedLabels = null,
LokiCredentials credentials = null,
string outputTemplate = DefaultOutputTemplate,
LogEventLevel restrictedToMinimumLevel = LevelAlias.Minimum,
int batchPostingLimit = 1000,
int?queueLimit = null,
TimeSpan?period = null,
ITextFormatter textFormatter = null,
IHttpClient httpClient = null)
{
if (sinkConfiguration == null)
{
throw new ArgumentNullException(nameof(sinkConfiguration));
}
var(batchFormatter, formatter, client) =
SetupClientAndFormatters(labels, excludedLabels, textFormatter, outputTemplate, httpClient, credentials);
return(sinkConfiguration.DurableHttpUsingFileSizeRolledBuffers(
LokiRoutesBuilder.BuildLogsEntriesRoute(uri),
bufferBaseFileName,
bufferFileSizeLimitBytes,
bufferFileShared,
retainedBufferFileCountLimit,
batchPostingLimit,
period,
formatter,
batchFormatter,
restrictedToMinimumLevel,
client));
}
