This PR is replacing the metrics.influxdb.host.tag cmd-line flag with metrics.influxdb.tags - a comma-separated key/value tags, that are passed to the InfluxDB reporter, so that we can index measurements with multiple tags, and not just one host tag.

This will be useful for Swarm, where we want to index measurements not just with the host tag, but also with bzzkey and git commit version (for long-running deployments).

cmd/swarm, metrics, swarm/api/client, swarm/storage, swarm/metrics, swarm/api/http: add instrumentation (#18274)

* cmd/swarm: add flag for application name (swarm or swarm-private)

* cmd/swarm/swarm-smoke: return correct exit code

* cmd/swarm/swarm-smoke: remove colorable

* remove swarm/grafana_dashboards

Co-authored-by: NJanos Guljas <janos@resenje.org>
Co-authored-by: NBalint Gabor <balint.g@gmail.com>
Co-authored-by: NAnton Evangelatov <anton.evangelatov@gmail.com>
Co-authored-by: NViktor Trón <viktor.tron@gmail.com>

* swarm: propagate ctx, enable opentracing

* swarm/tracing: log error when tracing is misconfigured

* cmd/swarm: minor cli flag text adjustments

* swarm/api/http: sticky footer for swarm landing page using flex

* swarm/api/http: sticky footer for error pages and fix for multiple choices

* cmd/swarm, swarm/storage, swarm: fix  mingw on windows test issues

* cmd/swarm: update description of swarm cmd

* swarm: added network ID test

* cmd/swarm: support for smoke tests on the production swarm cluster

* cmd/swarm/swarm-smoke: simplify cluster logic as per suggestion

* swarm: propagate ctx to internal apis (#754)

* swarm/metrics: collect disk measurements

* swarm/bmt: fix io.Writer interface

  * Write now tolerates arbitrary variable buffers
  * added variable buffer tests
  * Write loop and finalise optimisation
  * refactor / rename
  * add tests for empty input

* swarm/pss: (UPDATE) Generic notifications package (#744)

swarm/pss: Generic package for creating pss notification svcs

* swarm: Adding context to more functions

* swarm/api: change colour of landing page in templates

* swarm/api: change landing page to react to enter keypress