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.\" ========================================================================
.\"
.IX Title "Metrics::Any::Adapter::File 3pm"
.TH Metrics::Any::Adapter::File 3pm "2022-12-30" "perl v5.36.0" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
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.SH "NAME"
"Metrics::Any::Adapter::File" \- write metrics to a file
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\&   use Metrics::Any::Adapter \*(AqFile\*(Aq, path => "metrics.log";
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
This Metrics::Any adapter type writes observations of metric values into a
file. This may be helpful while debugging or otherwise testing code that
reports metrics.
.PP
For example, by setting the \f(CW\*(C`METRICS_ANY_ADAPTER\*(C'\fR environment variable to
configure the adapter, a metric log will be written as a side-effect of
running a unit test:
.PP
.Vb 1
\&   $ METRICS_ANY_ADAPTER=File:path=metrics.log perl \-Mblib t/01test.t
.Ve
.PP
The generated file can then be inspected to see what metric values were
reported while the program was running.
.PP
In particular, specifying the file \fI/dev/null\fR allows the full metrics
generation path to be tested with the code under test seeing a \*(L"real\*(R" adapter
even though the output goes nowhere.
.PP
.Vb 1
\&   $ METRICS_ANY_ADAPTER=File:path=/dev/null ./Build test
.Ve
.PP
Distribution and timing metrics are tracked with a running total and count of
observations.
.PP
This adapter type does not support batch mode reporting.
.SH "ARGUMENTS"
.IX Header "ARGUMENTS"
The following additional arguments are recognised
.SS "path"
.IX Subsection "path"
The path to the file to write to.
.SH "AUTHOR"
.IX Header "AUTHOR"
Paul Evans <leonerd@leonerd.org.uk>