[RFC proxmox{,-backup} 0/3] fix #6373: HTTP level keepalive for http2 backup reader connection

[Christian Ebner <c.ebner@proxmox.com>]

Patches implement a HTTP level keepalive mechanism to avoid of active
but idle http2 connections established by the backup reader being
dropped by reverse proxies.
Regular heartbeat requests are send to the Proxmox Backup Server, the
frequency based on a given timeout. Heartbeat traffic is only send if
no other requests have been send during the timeout period. The
timeout given in seconds is read from the
PBS_READER_HEARTBEAT_TIMEOUT environment variable, if not set no
heartbeat traffic is being send.

Since each HTTP request is being logged to the task log for http2
connections, implement a filtering logic allowing to exclude these
request logs to avoid log flodding.

If the chosen approach is acceptable, the timeout value might also
be passed as optional parameter on command invocation as well and
exposed in PVE as advanced parameter, although only important if
proxies are being used.

Example configurations for testing can be found on the individual
patch fixing the issue.

Link to the bugtracker issue:
https://bugzilla.proxmox.com/show_bug.cgi?id=6373

proxmox:

Christian Ebner (1):
  rest-server: add request logfilter by method and path in h2 service

 proxmox-rest-server/src/h2service.rs | 18 ++++++++++++++++--
 1 file changed, 16 insertions(+), 2 deletions(-)


proxmox-backup:

Christian Ebner (2):
  fix #6373: HTTP level reader heartbeat for proxy connection keepalive
  api: h2service: avoid logging heartbeat requests to task log

 pbs-client/src/backup_reader.rs | 69 ++++++++++++++++++++++++++++++---
 src/api2/backup/mod.rs          |  2 +-
 src/api2/reader/mod.rs          | 22 +++++++++--
 3 files changed, 84 insertions(+), 9 deletions(-)


Summary over all repositories:
  4 files changed, 100 insertions(+), 11 deletions(-)

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