Fixes string conversion bug + collect broadcast metrics

v0.1.11...v0.1.13

Somehow this repo got the tag v0.1.12, but not part of a release, hence the jump from v0.1.11 to v0.1.13.

• Collects broadcast packet metrics (#22)
• Renames metrics.yaml to metrics.yaml.sample (#23)
• Fixes an interface type conversion bug (#24)

Fix typo in metric name for ifHCInOctets

Fixes a typo of metric name for ifHCInOctets (#21)

* Fixes a typo of metric name for ifHCInOctets

Resolves issue #20.

* Adds Go module support to repository

The import path for the gosnmp library needed to change, as the old one
was deprecated and no longer in use. This commit also updates the
Dockerfile to use Go 1.16 and alpine 3.15.

* Changes necessary to support Go modules

I meant for this commit to be part of the previous commit (@1def767).
The previous commit introduced go.mod and go.sum, and this commit
includes some necessary changes to support that. Namely, the gosnmp
library moved to a new repository. I also updated the Docker image to Go
1.16 and alpine 3.15.

* Fixes a Go error

https://github.com/golang/go/issues/32479

* Uses fmt.Sprintf() instead of rune() for strconv

Sets ifAlias for uplink to actual ifAlias value on interface

v0.1.10

Sets ifAlias for uplink to actual ifAlias value on interface. (#17)

Adds label "ifAlias" to all exported SNMP metrics

Adds ifAlias label to all exported metrics. (#16)

* Adds ifAlias label to all exported metrics.

Adds new sample field "counter"

v0.1.8

Records raw OID counter in each sample. (#15)

Calculates filename based on actual timestamps inside file

Expect a string from gosnmp PDUs of type OctetString (#12)

* gosnmp now returns a string for PDU type OctetString

* Updates unit tests to use string type for OctetString PDU types.

Fixes evaluation of PDU type OctetString from gosnmp

#12

Weekly release

The primary feature of this release is that output filenames now properly reflect the last collection timestamp contained in the file.

Catches SIGTERM and writes all data before exiting

Catches SIGTERM and writes all data to disk before exiting. (#8)

* Catches SIGTERM and writes all data to disk before exiting.

* Defers ticker.Stop()s at invocation time, and returns immediately after Write() on a SIGTERM.

* Adds back mainCancel() to the sigterm case statement.

Calculates target when -target flag is missing.

v0.1.3

Attempts to construct a target switch name based on the node name in …